Yes, the android app 3.0.x does not yet support multipart transfer.
But good news: we just finished to implement it for the new 3.1 version.
We should push a beta version of the 3.1 to the store very soon and we would be very grateful if you can test and give some feedback:
With the 3.1 we’ve finalized the full rewrite of the app with latest technologies, that we began with the v3, focusing on UI layers for this branch, using Jetpack Compose.
On our side, we’ve made some tests with large files - on a good connection we could download and upload the latest Ubuntu image that is ~4,6 GB without any issue.
But we still want to fine tune and improve the error management and the control we have on the transfer to have better info when something goes wrong, typically on bad network connection. Stay tuned!