I have created an image bank, it displays and works perfectly for me:

However, when my colleagues log in and try to use it, they can't see any images and the search function doesn't return any results.
The PowerApp is shared with everyone, they can access it but cant see the gallery.
The images are saved in a document library in my SharePoint Online page. As far as i can see that too has been shared with everyone.
Has anyone experienced a similar error or can you suggest what i can do to try and fix this as i am dont understand why this is happening.
thanks
Alistair