You are better suited going through Wix Support for that issue, this forum is for issues that are code related to your page. https://support.wix.com/en/about-wix/contacting-wix-support
Wix Pro Gallery also have their own Wix Support pages that you can find here.
In the meanwhile, simply try logging out of Wix Editor and closing your browser and then clearing cookies and cache and then restarting your browser and logging back into Wix Editor.
Or simply try logging into Wix Editor through a different browser to see it makes any difference.
I do have a ticket in with them, but being the weekend, not expecting any replies. I did clear cache and cookies and had same results. Didn't think to try a different browser, so just did. That's helped enough to get my pics uploaded but it's still being glitchy. Working between the two, seems to get me some forward progress. Thanks for your thoughts!