I’m not quite sure why you’re doing this…
I just did the following…
- Add an Image Gallery widget
- Connected it to a virtual pin with an integer data type
- Added one image. I chose this url…
https://community.blynk.cc/uploads/default/original/3X/4/a/4a22d66cc853cd9346048882c0a63b487a89322b.png
which is this image from the image sharing topic…
- Hit the tick icon to save the image
Used the HTTP set property API to rotate it by x degrees (I was too lazy to write a sketch and upload it to a device 
)
It works fine, although part of the image is cropped-of at angles around the 45, 135, 225 and 315 degrees areas, but that’s just the design of the image I chose.
Pete.