I use this site to reduce my images, I have an old school camera and not a smart phone:
https://www.reduceimages.com/
I just follow their prompts, drag my picture to the spot and click defaults twice to first resize and then download. I have no connection with that website other than it is simple, easy, and does not set off my various virus and spam blockers.
Once downloaded, I post here -- and about half the time I forget to stretch out the window to get to the upload button.