fix: s3 user annotations (#2541)

do _not_ attempt to create the user annotations directory if an s3 location is specified

server/common/config/dataset_config.py

@@ -4,6 +4,7 @@
 from server.common.annotations.local_file_csv import AnnotationsLocalFile
 from server.common.config.base_config import BaseConfig
 from server.common.errors import ConfigurationError, AnnotationsError
+from server.common.utils.data_locator import DataLocator
 from server.data_common.matrix_loader import MatrixDataLoader
 
 
@@ -127,11 +128,15 @@ def handle_local_file_csv_annotations(self, context):
             if lf_ext and lf_ext != ".csv":
                 raise ConfigurationError(f"genesets file type must be .csv: {genesets_filename}")
 
-        if dirname is not None and not isdir(dirname):
-            try:
-                os.mkdir(dirname)
-            except OSError:
-                raise ConfigurationError("Unable to create directory specified by --user-generated-data-dir")
+        if dirname is not None:
+            if not DataLocator(dirname).islocal():
+                # remote object stores only support objects but not directories, do nothing
+                pass
+            elif not isdir(dirname):
+                try:
+                    os.mkdir(dirname)
+                except OSError:
+                    raise ConfigurationError("Unable to create directory specified by --user-generated-data-dir")
 
         anno_config = {
             "user-annotations": self.user_annotations__enable,