I think you can open the photo in Paint and reduce the size.

A year ago you asked the same question what solution did you use then to be able to upload photos?
Just click on your user name to see all your many posts.

I see you managed to post many projects, so fortunately it does not happen " always". Your pictures must be under 3Mb. For pictures of embroidery and so on I set my camera to medium or even low as the higher definition ones turn out to be too large for here. I just have to remember to set it to back to the best quality for more serious photos!