UPDATE (4.11.2022 at 7:45 AM EST): We have released a patch for the Dropbox issue on iOS (9.19.2). Please make the update and let us know if you run into any issues.
We are aware of any issue where forms are getting stuck on download on iOS devices. We believe this has something to do with Dropbox integrations. We are working on and currently testing a solution for this issue. A patch will be released to the App Store and soon as it is ready and will keep this space updated.