Accept uppercase image extensions (.JPG, .PNG, etc.)

app.py

@@ -374,7 +374,7 @@ with gr.Blocks(title="Gray Leaf Spot Segmentation", css=CSS) as demo:
 
     with gr.Accordion("📂 Step 1 — Upload Images", open=True):
         upload = gr.File(label="Drag & drop petri dish images", file_count="multiple",
-                         file_types=[".jpg",".jpeg",".png",".tif",".tiff",".bmp",".webp"])
+                         file_types=["image"])
         up_st = gr.Markdown("")
 
     with gr.Accordion("⚙️ Step 2 — Settings", open=True):