Hi @Anonymous ,
Do you want to save Images data into your local device when your device is offline?
Based on the needs that you mentioned, I think SaveData function and LoadData function in PowerApps could achieve your needs. Please check and see if the following blog would help in your scenario:
https://powerapps.microsoft.com/en-us/blog/savedata-and-loaddata-unleashed/
On your side, you could consider add a "Add Picture" control to pick up pictures from your local device. Then use the following formula to collect the captured images into a Collection:
Collect(Pictures, UploadedImage1.Image)
please use the following formula to save the Pictures collection into your local device:
SaveData(Pictures, "Saved Pictures")
then use the following formula to load cached Pictures collection data into your app:
LoadData(Pictures, "Saved Pictures", true)
Please take a try with above solution, check if the issue is solved.
Best regards,