diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index b9f532e228..e443b28677 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -21,6 +21,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 
 ### Fixed
 - Fixed that listing datasets with the `api/datasets` route without compression failed due to missing permissions regarding public datasets. [#8249](https://github.com/scalableminds/webknossos/pull/8249)
+- Fixed a bug that uploading a zarr dataset with an already existing `datasource-properties.json` file failed. [#8268](https://github.com/scalableminds/webknossos/pull/8268)
 - Fixed that the frontend did not ensure a minium length for annotation layer names. Moreover, names starting with a `.` are also disallowed now. [#8244](https://github.com/scalableminds/webknossos/pull/8244)
 - Fixed a bug where in the add remote dataset view the dataset name setting was not in sync with the datasource setting of the advanced tab making the form not submittable. [#8245](https://github.com/scalableminds/webknossos/pull/8245)
 - Fix read and update dataset route for versions 8 and lower. [#8263](https://github.com/scalableminds/webknossos/pull/8263)
diff --git a/webknossos-datastore/app/com/scalableminds/webknossos/datastore/services/uploading/UploadService.scala b/webknossos-datastore/app/com/scalableminds/webknossos/datastore/services/uploading/UploadService.scala
index 23f2781788..ec262c77e7 100644
--- a/webknossos-datastore/app/com/scalableminds/webknossos/datastore/services/uploading/UploadService.scala
+++ b/webknossos-datastore/app/com/scalableminds/webknossos/datastore/services/uploading/UploadService.scala
@@ -466,10 +466,10 @@ class UploadService @Inject()(dataSourceRepository: DataSourceRepository,
   }
 
   private def guessTypeOfUploadedDataSource(dataSourceDir: Path): UploadedDataSourceType.Value =
-    if (looksLikeZarrArray(dataSourceDir, maxDepth = 2).openOr(false)) {
-      UploadedDataSourceType.ZARR
-    } else if (looksLikeExploredDataSource(dataSourceDir).openOr(false)) {
+    if (looksLikeExploredDataSource(dataSourceDir).openOr(false)) {
       UploadedDataSourceType.EXPLORED
+    } else if (looksLikeZarrArray(dataSourceDir, maxDepth = 2).openOr(false)) {
+      UploadedDataSourceType.ZARR
     } else if (looksLikeZarrArray(dataSourceDir, maxDepth = 3).openOr(false)) {
       UploadedDataSourceType.ZARR_MULTILAYER
     } else if (looksLikeNeuroglancerPrecomputed(dataSourceDir, 1).openOr(false)) {