Hello @mgeorge46 ,
Yes, that is the PowerApps (strange) dataUri format, however for a JPG to convert to Base64 (the image), you need to remove the first 23 and last 1 character I believe (that is what mine have to do)
So :-
UpdateContext({vPhoto:JSON(<YourImageName>.Image,JSONFormat.IncludeBinaryData)});
UpdateContext({vPhoto:Mid(vPhoto,24,Len(vPhoto) - 24)})
If the numbers are different for yours, just change the above to suit.
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