Submit button disabled without video, bigger middle part and dropzone, button in dropzone

electron/main/script.js

@@ -129,4 +129,21 @@ function loadLanguageOptions(){
     console.log("Error in script.js loadLanguageOptions function");
     console.log(error);
   }
-}
+}
+
+function activateSubmitBtn(hasFile){
+  submitButton.disabled = !hasFile;
+}
+
+videoUpload.addEventListener("change", () => {
+  activateSubmitBtn(videoUpload.files.length > 0);
+});
+
+uploadContainer.addEventListener("drop", (e) => {
+  e.preventDefault();
+  const file = e.dataTransfer.files[0];
+
+  if(file){
+    activateSubmitBtn(true);
+  }
+});