diff --git a/apps/files_sharing/lib/SharedStorage.php b/apps/files_sharing/lib/SharedStorage.php
index 77019e25265..34a21fcd637 100644
--- a/apps/files_sharing/lib/SharedStorage.php
+++ b/apps/files_sharing/lib/SharedStorage.php
@@ -258,11 +258,17 @@ class SharedStorage extends \OC\Files\Storage\Wrapper\Jail implements ISharedSto
 				case 'xb':
 				case 'a':
 				case 'ab':
-					$creatable = $this->isCreatable($path);
+					$creatable = $this->isCreatable(dirname($path));
 					$updatable = $this->isUpdatable($path);
 					// if neither permissions given, no need to continue
 					if (!$creatable && !$updatable) {
-						return false;
+						if (pathinfo($path, PATHINFO_EXTENSION) === 'part') {
+							$updatable = $this->isUpdatable(dirname($path));
+						}
+
+						if (!$updatable) {
+							return false;
+						}
 					}
 
 					$exists = $this->file_exists($path);