This page documents known developer concerns with the Classroom add-ons API.
Error messages
Most errors are covered in the descriptions of specific methods in the reference documentation. Some errors are specific to add-ons.
If you're unable to troubleshoot an error on your own, reach out to your Google contacts for support.
CourseWork API compatibility
See the Create attachments from a third-party site guide to creating add-on attachments through a CourseWork flow.
Pop-up blockers
The add-on sign-in flow can be disrupted if the end user has enabled a pop-up blocker. See the manage pop-up blockers section of the frictionless sign-in page for more information about how to implement the sign-in flow in the event that end users enable pop-up blockers.
Multi-login
Multi-login is not supported for add-ons. See the multi-login section of the frictionless sign-in page for more information about multi-login issues and possible workarounds.