@Anonymous
1. ensure the users has enough permission to have access to onedrive data. In addition to sharing apps, you need to share data intentionally
2. check the Items property of Form, it should be GalleryName.Selected
3. re-create a new conneciton to the Excel file (Excel table) stored in your OneDrive within your app
4. If you have something in OnStart property, remove it and see if it still gets stuck
5. If this doesn't work, please share more properties and screenshots of your form.
Sik