thank you for your reply. I’ve installed the WebM plugin for Premiere and exported is as such. It did start uploading, but it’s stuck at “processing 1%” now for an hour or so.
I now also encountered this article stating only .flv is supported in designer: Designer (Legacy) | Are transparent (alpha) videos supported?
But I also noticed the article you shared saying I should be using WebM. Furthermore .flv is a non-existing codec by now. It’s a flash component, but flash got killed quite some time ago. After that NLE’s stopped supporting this format.
It’s getting quite cumbersome at this moment I must say. It’s good that there’s online documentation, but it doesn’t help if it’s contradicting and not updated.
Or is Legacy a previous version of designer? I’m not English native, not really sure what it means.
I sent out a support ticket to Zappar with a link to the WebM file I try to upload.