OK @phearin ,
You must have been lucky on that one as the way PowerApps launches URLs (anonymously), they have never displayed for me.
However, to fix is not difficult. Create a field in your SharePoint library called Thumbnail and set this to type Hyperlink or Picture > Picture. You can also use this to display the picture in SharePoint.
The Image property of the Image control in PowerApps is then (substitute your names)
For a Gallery Items image
ThisItem.'Thumbnail ({Thumbnail})'.Large //you can also use Medium and Small
For a single matching image
LookUp(
YourSharePointLibraryName,
YourReference=MatchingLibraryValue,
'Thumbnail ({Thumbnail})'.Large
)
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