Providing access permissions to members for all files in one go

Hi everyone,

I have spent a ton of time creating a lot of designs (files) and am trying to give access to new members to all the designs in one go. It seems I can only either manually share each design one by one (not ideal as there's a lot) or give the members access to a project and theoretically move the file to the project however when I try this I get the error "Folders, PSC, AIC, generic assets and files made in the prior version of Adobe Express cannot be moved to projects". We've only just made these files in the last few weeks and working on the browser version so could this really be an old version of express? 

Seems ridiculous to have to manually share each inidividual file vs a whole folder. 

Any ideas on how to do this would be much apprecited!