It is known since many, many months that a lot of people have problems when uploading watch-faces to the store:
What are they expecting me to do? To stop programming?
I really don't know why they are not able to manage this...
See https://forums.garmin.com/developer/connect-iq/i/bug-reports/appstore---unable-to-upload-app-updates
One of the Garmin folks is posting there.
Had this is as well. Are you trying to add emojis in the description? Remove all kinds of emojis. Otherwise, use the network inspector on your browser and check the details of the failed request on their…
See https://forums.garmin.com/developer/connect-iq/i/bug-reports/appstore---unable-to-upload-app-updates
One of the Garmin folks is posting there.
Had this is as well. Are you trying to add emojis in the description? Remove all kinds of emojis. Otherwise, use the network inspector on your browser and check the details of the failed request on their backend. It helps you solve the issue with more information.