You can see this from the Account page.
The Player (powered by alphaTab™) only supports Guitar Pro files (.gp3, .gp4, .gp5, .gpx).
The Player (powered by alphaTab™) is currently in beta, which means you may experience some issues on certain browser/device combinations. You can report these via the Report Issue page.
Look for the icon at the top of the page. It will turn green when you have notifications.
Search for their username in the search bar at the top of the page. Once you find them, select Add Friend. They'll get the request and once they accept, you can add them as a contributor to projects or vice versa.
Tab versions are owned by the owner of the project. This means that if you add a new tab or tab version to your bandmate's project, it is attached to their account and not yours. Likewise, any tabs or tab versions added by your bandmates to your own projects are attached to your account.
You can add bandmates to your projects from the project edit screen once you are friends. Look for the button beneath each project on the projects page, or the Edit Project button on the Tabs page. Select the desired user from the Contributors drop down and select Save. Once you add them, they'll see your projects under the Their Projects tab on the Tab page.
You can remove contributors from your projects from the project edit screen. Look for the button beneath each project on the projects page, or the Edit Project button on the Tabs page. Select the next to the user and select Save. They'll no longer have access to the project.
If you're experiencing weird behavior on the app, you may have found a bug! Report the issue using the Report Issue link at the top of the page.
Send us an email at support@tabcollab.com with your question and we'll get back to you as soon as possible. If it's a common question, we'll add it to this page!