Thanks for bringing your question to the community! We have guidelines for image size in this article. I also have some steps for you to take in Paint so you can resize your images in accordance with those guidelines:
- Right click the image you would like to resize and choose Edit
- In the Paint window that comes up, click the Resize button near the top
- Click the Pixels button, then bring the Horizontal size to 600 or less
- Click the menu in the top left and save your image
Once that's done, you should be able to upload your images with no problems.
Nate M. Community Support
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