Google’s Reverse Image Search has an option to search from an image URL, instead of uploading an image.
And images stored in AppSheet can be shared with a public URL–
Secure image access is turned OFF.
By adding the public image URL to the end of the Google Reverse Image Search URL, a reverse image search can be opened from an action:
"https://www.google.com/searchbyimage?&image_url=" & ENCODEURL(CONCATENATE( "https://www.appsheet.com/template/gettablefileurl?appName=", "YOUR_APP_NAME", "&tableName=", "YOUR_TABLE_NAME", "&fileName=" ,[IMAGE_COLUMN_NAME]))