Trouble with sizing and uploading photos to blog seems to be a recurring issue. Below are some tools that might help with uploading photos to your blog and website. Compressing photos also helps with your website load speed. If you're still having problems uploading photos, try one of the tools below and see if any of them help.
Personally, I seem to use Squoosh a lot. Easy drag and drop. I'm going to use Squoosh now and drag a random photo from my desktop. The file dimesion is 3926 x 2898 and 1.77 MB before I drag and drop it into Squoosh. I reduced it 12% to 1.56 MB. It took approx 2 seconds for the AR Insert/Edit toll to upload it, and less than 1 second after that to post it below. It was a little large to fit below, so I dragged the corner in a couple times to get the size below.
Photo is view across Potomac river from Lovettsville VA towards Brunswick and Weverton MD.
ImageAlpha for MACs - https://www.macupdate.com/app/mac/59647/imagealpha
ImageOptim - https://imageoptim.com/
Compressor - https://compressor.io/
Fileoptimizer for Windows - https://www.microsoft.com/en-us/p/media-file-optimizer/9nblggh58smm?activetab=pivot:overviewtab
Squoosh - https://squoosh.app/
Jeff Pearl / Lic in VA
Offices in VA, MD, DC, and PA