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Multi-user access isn't directly available with Synthasite as yet. It is certainly in their plan for future upgrades but no time line has been promised.
You possibly have a solution or workaround though. If your users can have their images hosted remotely and send you the url links, then you could either link or embed those files and you would have them on your site. The attributes details could be managed by the image hosting facility in their comments lines or by a separate communication with you.
The quality and reliability of Synthasite is appropriate for such a project and it's free with no site size restriction .