AFAIK, you can't do this with Gallery in Revo. You can upload photos from the front end with MaxiGallery but that only works with Evolution.
You might want to make a minimal stripped down user identity in the Manager that will allow your users can upload photos via Gallery...
I actually was able to do this in the front-end. But I needed to tweak FileUpload ( modify it for my needs ) and then reverse-engineer gallery database table structures. When file was uploaded, I made database query to update the database and copied the file to correct location.
That sounds like a good feature request for Gallery
https://github.com/splittingred/Gallery/issues.
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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODx info for everyone:
http://bobsguides.com/MODx.html
@antti75
This sounds like exactly what I need! Are you able to share how you achieved this? Can this be added to the gallery or fileupload snippet?