I normally use this website download the pic and follow the instructions and be sure not exceed over a 150K. If that don't work whatever site your using just keep decreasing the pixels until it work.

EXAMPLE: 300x300 250x250 200x200 150x150

NOTE: Using the website given will tell you the exact file size of the picture you're using so you will be able to get it right the first time around.

Hope this help and good luck.

https://resizeimage.net/