I also struggle with this error saying, 'can't find existed resource duplicate for optimized resource 0' I can't upload rtb files that I downloaded from MIRO now.. What should I do?

Hey @CHAN,

Thanks for letting us know about this error you're seeing! For us to investigate this issue further, we'll require access to the backup file you're trying to upload so I'm going to convert this post to the ticket and get in touch with you there shortly.