Sorry for the late reply, I thought I replied already, but I noticed that I actually didn't after checking the forums again...
Good news, the problem with the extension case is fixed on my side (I used my old template for the sendlink.html which explains why it didn't work... I reuploaded imagevuex v 2.1.6 overwriting the templates and it's fine now).
BUT, the problem with the space in the folder remains.
Actually, the email you sent me through your site didn't work (I forwarded it to you so you can check by yourself if it works).
When I click on the link, it does take me to the gallery, but no image loads (maybe you should try to click the link too and tell me if it works for you: https://www.photo.gallery/soda/#/content/test+folder/TEST.JPG), obviously because of the "+" in the url...
When I replace the "+" with a "space" (or "%20") (https://www.photo.gallery/soda/#/content/test folder/TEST.JPG), then it works.
The thumbnail in the email doesn't show for the same reason (the "+" in the source url of the thumbnail) but the extension case problem was indeed fixed though.
Anyway, thanks for your help