createAsset improvements in error checking and capabilities. #5918
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Identify the Bug or Feature request
fixes #5917
Description of the Change
createAsset was using strings to check for image format and could fail. This is now using bytes.
You could not take a base64 encoded PNG string (but base64 encoded webp would work??) and use it with createAsset.
Possible Drawbacks
There should be none.
This change is