The file too big message is about the amount of data contained in the picture, cropping or sizing doesn't change that. Depending on how the picture was taken you need to do different things. Often the cell phones have an option for sharing that automatically reduces the file.
With my old school digital camera and desktop computer and browser options, I use this site (no affiliation) because it is quick, easy, free and doesn't set off my various protections and such.
https://www.reduceimages.com/
I plug my camera into my compute and drag the file onto the website. I use their defaults -- one click to do the reduction and then another to download it to your computer. Then I come here and upload.
BTW -- grats to you for getting as far as the "too large" message. I still miss the upload button to the far right of the file select screen about half the time. And I time out at least half the time so I've learned to copy my post before hitting Quick Reply.
edit: The Help section here has some really good help
https://www.quiltingboard.com/vbulle...lp-center-f27/