Hi @Anonymous ,
I'm afraid it's not supported to display an image file directly in PowerApps currently.
I suggest you express your views on PowerApps Ideas Forum. Your precious advice will be very helpful for our work.
https://powerusers.microsoft.com/t5/PowerApps-Ideas/idb-p/PowerAppsIdeas
Here are two alternative way for your reference:
1)download the image fields to your compter and upload it to PowerApps.
(File->Media)
save the images to one collection
ClearCollect(test,{value:'1'},{value:'2'},{value:'3'}) (1,2,3 is my images name)
Then, set the gallery's Items to the collection name.
2)create an excel file, save images in it.
save image to a column named [image]
Then you could use the excel as data source and display the images in gallery directly.
Here's a doc about it for your reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/tutorial-working-with-images-in-excel
Best regards,
Community Support Team _ Phoebe Liu