Hi @StuCundy ,
Do you want to upload images by using add media control from powerapps to sharepoint , then display this image in powerapps?
If so, firstly please notice that you saved wrong image data to sharepoint.
Data like this: "appress://blobmanager/63....." is not a kind of temporary data in powerapps, not an image file.
If you save this to sharepoint, you just save some string data, not a real image file. So you will not be able to display it as image in powerapps.
The correct steps should be like this:
1)create a hyperlink data type field in sharepoint list
(Picture data type field is read-only in powerapps.)
2)create a flow about this feather:
create image file by using blob data in powerapps, then upload this file to sharepoint library, get this file's link, then response this link to your app.
( It's not supported to create image file by using blob data in powerapps. You need to use flow to make this.)
Here's a blog about how to create this kind of flow in details for your reference:
http://www.cleverworkarounds.com/2019/06/08/getting-pics-to-sharepoint-from-powerapps-is-getting-easier/
Please notice that the flow in this doc does not include the last two steps: get this file's link, then response this link to your app.
You need to make a little change.
The flow should be like this:


3)in your powerapps:
insert an add picture control
insert a button to call the above flow to call this flow
The button's OnSelect:
ClearCollect(pics, { Pic: UploadedImage1.Image, Name: Rand() & ".jpg"});Set(stuff, JSON(pics,JSONFormat.IncludeBinaryData));
Set(link,'Copyof-pic7'.Run(stuff))
//'Copyof-pic7 is my flow name
Then you could get the created file's link by using:
link.response
Please use this to update your hyperlink column.
The hyperlink column should be updated by data like this:
https://.......0.5270xxxx.jpg
Best regards,