diff --git a/iopaint/api.py b/iopaint/api.py
index 8fa7bfd..cace639 100644
--- a/iopaint/api.py
+++ b/iopaint/api.py
@@ -167,6 +167,7 @@ class Api:
         self.add_api_route("/api/v1/run_plugin_gen_image", self.api_run_plugin_gen_image, methods=["POST"])
         self.add_api_route("/api/v1/samplers", self.api_samplers, methods=["GET"])
         self.add_api_route("/api/v1/adjust_mask", self.api_adjust_mask, methods=["POST"])
+        self.add_api_route("/api/v1/save_image", self.api_save_image, methods=["POST"])
         self.app.mount("/", StaticFiles(directory=WEB_APP_DIR, html=True), name="assets")
         # fmt: on
 
@@ -179,6 +180,12 @@ class Api:
     def add_api_route(self, path: str, endpoint, **kwargs):
         return self.app.add_api_route(path, endpoint, **kwargs)
 
+    def api_save_image(self, file: UploadFile):
+        filename = file.filename
+        origin_image_bytes = file.file.read()
+        with open(self.config.output_dir / filename, "wb") as fw:
+            fw.write(origin_image_bytes)
+
     def api_current_model(self) -> ModelInfo:
         return self.model_manager.current_model
 
diff --git a/iopaint/cli.py b/iopaint/cli.py
index 88fda7b..951fbb4 100644
--- a/iopaint/cli.py
+++ b/iopaint/cli.py
@@ -144,7 +144,10 @@ def start(
     device = check_device(device)
     if input and not input.exists():
         logger.error(f"invalid --input: {input} not exists")
-        exit()
+        exit(-1)
+    if input and input.is_dir() and not output_dir:
+        logger.error(f"invalid --output-dir: must be set when --input is a directory")
+        exit(-1)
     if output_dir:
         output_dir = output_dir.expanduser().absolute()
         logger.info(f"Image will be saved to {output_dir}")
diff --git a/iopaint/file_manager/file_manager.py b/iopaint/file_manager/file_manager.py
index cb33278..413162c 100644
--- a/iopaint/file_manager/file_manager.py
+++ b/iopaint/file_manager/file_manager.py
@@ -27,18 +27,11 @@ class FileManager:
             self.thumbnail_directory.mkdir(parents=True)
 
         # fmt: off
-        self.app.add_api_route("/api/v1/save_image", self.api_save_image, methods=["POST"])
         self.app.add_api_route("/api/v1/medias", self.api_medias, methods=["GET"], response_model=List[MediasResponse])
         self.app.add_api_route("/api/v1/media_file", self.api_media_file, methods=["GET"])
         self.app.add_api_route("/api/v1/media_thumbnail_file", self.api_media_thumbnail_file, methods=["GET"])
         # fmt: on
 
-    def api_save_image(self, file: UploadFile):
-        filename = file.filename
-        origin_image_bytes = file.file.read()
-        with open(self.output_dir / filename, "wb") as fw:
-            fw.write(origin_image_bytes)
-
     def api_medias(self, tab: MediaTab) -> List[MediasResponse]:
         img_dir = self._get_dir(tab)
         return self._media_names(img_dir)
diff --git a/web_app/src/components/Settings.tsx b/web_app/src/components/Settings.tsx
index 5138e03..18a021c 100644
--- a/web_app/src/components/Settings.tsx
+++ b/web_app/src/components/Settings.tsx
@@ -644,7 +644,6 @@ export function SettingsDialog() {
                 <Button
                   key={item}
                   variant="ghost"
-                  disabled={item === TAB_PLUGINS && !removeBGEnabled}
                   onClick={() => setTab(item)}
                   className={cn(
                     tab === item ? "bg-muted " : "hover:bg-muted",