Sorry you are having trouble. Here's a suggestion:
1. Launch Premiere Clip on one device and make sure it is not open on any other devices.
2. On the device it is open on, delete the projects that are no longer needed.
3. Let the application sync (leave it open and do not background it) so that the projects are marked as deleted on the service. A spinning circle icon will pop up on the lower left corner of your device while syncing is in progress.
4. Uninstall the application on other devices, then re-install and log-in to let the remaining projects sync.
Please let us know if this solves your issue or if you need more assistance.
I got the same issue on Sony Z3 with android 5.1.1. Premiere Clip is 18.104.22.1682. Further more, I can't copy a project, either. By the way, I use only one device... Will my projects exist after I reinstall Premiere Clip? How can I fix it?
Premiere Clip is designed to sync your projects so that you have the ability to work across devices. First, make sure you are connected to wifi so that your projects can sync. Delete the project you want to remove, and leave the app open until you no longer see a spinning circle in the lower left of the screen.
As far as not being able to copy a project, that sounds like a different issue and it would be great to get some more information so that we can help you. If you tap on duplicate from your projects list, what happens?
Thank you. Nothing happened when I tap on duplicate icon. Finally I reinstall the APP. It automatically download all other projects except the one I can't duplicate. So I think the project didn't sync to the cloud... Anyway, I make the project again very carefully. I now make every change after the sync icon disappear and so far so good^^