rx.upload must include _var_data from props

str-casting the dropzone arguments removed any VarData they depended on, like
the state context.

update test_upload to include passing a prop from a state var

reflex/components/core/upload.py

@@ -293,13 +293,15 @@ class Upload(MemoizationLeaf):
             format.to_camel_case(key): value for key, value in upload_props.items()
         }
 
-        use_dropzone_arguments = {
+        use_dropzone_arguments = Var.create(
+            {
                 "onDrop": event_var,
                 **upload_props,
             }
+        )
 
         left_side = f"const {{getRootProps: {root_props_unique_name}, getInputProps: {input_props_unique_name}}} "
-        right_side = f"useDropzone({str(Var.create(use_dropzone_arguments))})"
+        right_side = f"useDropzone({str(use_dropzone_arguments)})"
 
         var_data = VarData.merge(
             VarData(
@@ -307,6 +309,7 @@ class Upload(MemoizationLeaf):
                 hooks={Hooks.EVENTS: None},
             ),
             event_var._get_all_var_data(),
+            use_dropzone_arguments._get_all_var_data(),
             VarData(
                 hooks={
                     callback_str: None,

tests/integration/test_upload.py

@@ -23,6 +23,7 @@ def UploadFile():
         _file_data: Dict[str, str] = {}
         event_order: List[str] = []
         progress_dicts: List[dict] = []
+        disabled: bool = False
 
         async def handle_upload(self, files: List[rx.UploadFile]):
             for file in files:
@@ -56,6 +57,7 @@ def UploadFile():
                     rx.button("Select File"),
                     rx.text("Drag and drop files here or click to select files"),
                 ),
+                disabled=UploadState.disabled,
             ),
             rx.button(
                 "Upload",