diff --git a/src/specklepy/api/resources/current/file_import_resource.py b/src/specklepy/api/resources/current/file_import_resource.py
index 514d50c..693f64b 100644
--- a/src/specklepy/api/resources/current/file_import_resource.py
+++ b/src/specklepy/api/resources/current/file_import_resource.py
@@ -1,5 +1,6 @@
 from pathlib import Path
 
+from deprecated import deprecated
 from typing_extensions import override
 
 from specklepy.core.api.inputs import (
@@ -10,7 +11,10 @@ from specklepy.core.api.inputs import (
 from specklepy.core.api.models import FileImport, FileUploadUrl
 from specklepy.core.api.models.current import ResourceCollection
 from specklepy.core.api.resources import FileImportResource as CoreResource
-from specklepy.core.api.resources.current.file_import_resource import UploadFileResponse
+from specklepy.core.api.resources.current.file_import_resource import (
+    FILE_UPLOAD_DEPRECATION_WARNING,
+    UploadFileResponse,
+)
 from specklepy.logging import metrics
 
 
@@ -25,11 +29,6 @@ class FileImportResource(CoreResource):
             server_version=server_version,
         )
 
-    @override
-    def start_file_import(self, input: StartFileImportInput) -> FileImport:
-        metrics.track(metrics.SDK, self.account, {"name": "File Import Start"})
-        return super().start_file_import(input)
-
     @override
     def generate_upload_url(self, input: GenerateFileUploadUrlInput) -> FileUploadUrl:
         """
@@ -61,6 +60,13 @@ class FileImportResource(CoreResource):
         metrics.track(metrics.SDK, self.account, {"name": "File Import Download File"})
         return super().download_file(project_id, file_id, target_file)
 
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
+    @override
+    def start_file_import(self, input: StartFileImportInput) -> FileImport:
+        metrics.track(metrics.SDK, self.account, {"name": "File Import Start"})
+        return super().start_file_import(input)
+
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
     @override
     def finish_file_import_job(self, input: FinishFileImportInput) -> bool:
         """
@@ -72,6 +78,7 @@ class FileImportResource(CoreResource):
         metrics.track(metrics.SDK, self.account, {"name": "File Import Finish Job"})
         return super().finish_file_import_job(input)
 
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
     @override
     def get_model_file_import_jobs(
         self,
diff --git a/src/specklepy/core/api/resources/current/file_import_resource.py b/src/specklepy/core/api/resources/current/file_import_resource.py
index eed025a..e17a323 100644
--- a/src/specklepy/core/api/resources/current/file_import_resource.py
+++ b/src/specklepy/core/api/resources/current/file_import_resource.py
@@ -2,6 +2,7 @@ from pathlib import Path
 from typing import Any
 
 import httpx
+from deprecated import deprecated
 from gql import Client, gql
 
 from specklepy.core.api.credentials import Account
@@ -23,6 +24,16 @@ class UploadFileResponse(GraphQLBaseModel):
     etag: str
 
 
+FILE_UPLOAD_DEPRECATION_WARNING: dict[str, Any] = {
+    "version": "3.2.4",
+    "reason": (
+        "Part of the old API surface"
+        "and will be removed in the future. Use the new ingestion API instead."
+        "Field will be deleted on June 1st, 2026"
+    ),
+}
+
+
 class FileImportResource(ResourceBase):
     """API Access class for file imports"""
 
@@ -41,59 +52,6 @@ class FileImportResource(ResourceBase):
             name=NAME,
         )
 
-    def finish_file_import_job(self, input: FinishFileImportInput) -> bool:
-        """
-        This is mostly an internal api, that marks a file import job finished.
-
-        Only use this if you are writing a file importer, that is responsible for
-        processing file import jobs.
-        """
-        QUERY = gql(
-            """
-                mutation FinishFileImport($input: FinishFileImportInput!) {
-                    data:fileUploadMutations {
-                        data:finishFileImport(input: $input)
-                    }
-                }
-            """
-        )
-
-        variables = {
-            "input": input.model_dump(warnings="error", by_alias=True),
-        }
-
-        return self.make_request_and_parse_response(
-            DataResponse[DataResponse[bool]], QUERY, variables
-        ).data.data
-
-    def start_file_import(self, input: StartFileImportInput) -> FileImport:
-        QUERY = gql(
-            """
-            mutation StartFileImport($input: StartFileImportInput!) {
-                data:fileUploadMutations {
-                    data:startFileImport(input: $input) {
-                        id
-                        projectId
-                        convertedVersionId
-                        userId
-                        convertedStatus
-                        convertedMessage
-                        modelId
-                        updatedAt
-                    }
-                }
-            }
-        """
-        )
-
-        variables = {
-            "input": input.model_dump(warnings="error", by_alias=True),
-        }
-
-        return self.make_request_and_parse_response(
-            DataResponse[DataResponse[FileImport]], QUERY, variables
-        ).data.data
-
     def generate_upload_url(self, input: GenerateFileUploadUrlInput) -> FileUploadUrl:
         """
         Get a file upload url from the Speckle server.
@@ -161,6 +119,62 @@ class FileImportResource(ResourceBase):
                     _ = f.write(chunk)
         return target_file
 
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
+    def start_file_import(self, input: StartFileImportInput) -> FileImport:
+        QUERY = gql(
+            """
+            mutation StartFileImport($input: StartFileImportInput!) {
+                data:fileUploadMutations {
+                    data:startFileImport(input: $input) {
+                        id
+                        projectId
+                        convertedVersionId
+                        userId
+                        convertedStatus
+                        convertedMessage
+                        modelId
+                        updatedAt
+                    }
+                }
+            }
+        """
+        )
+
+        variables = {
+            "input": input.model_dump(warnings="error", by_alias=True),
+        }
+
+        return self.make_request_and_parse_response(
+            DataResponse[DataResponse[FileImport]], QUERY, variables
+        ).data.data
+
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
+    def finish_file_import_job(self, input: FinishFileImportInput) -> bool:
+        """
+        This is mostly an internal api, that marks a file import job finished.
+
+        Only use this if you are writing a file importer, that is responsible for
+        processing file import jobs.
+        """
+        QUERY = gql(
+            """
+                mutation FinishFileImport($input: FinishFileImportInput!) {
+                    data:fileUploadMutations {
+                        data:finishFileImport(input: $input)
+                    }
+                }
+            """
+        )
+
+        variables = {
+            "input": input.model_dump(warnings="error", by_alias=True),
+        }
+
+        return self.make_request_and_parse_response(
+            DataResponse[DataResponse[bool]], QUERY, variables
+        ).data.data
+
+    @deprecated(**FILE_UPLOAD_DEPRECATION_WARNING)
     def get_model_file_import_jobs(
         self,
         *,