What is the maximum size photo that can be uploaded to the MLS?

The max file size is 15 MB or 3000×2000 pixels. Some other tips to keep in mind in regard to listing photos are: Flex allows you to add or remove photos, rearrange the order of photos, add titles and captions, change the primary photo, and edit photo privacy settings. Please keep in mind that the MLS rules require that the primary photo is an exterior view of the home. The primary photo is the photo with the blue box around it when you are uploading or editing photos. To mark a different photo as primary, click the flag icon. Changes to photos are automatically saved.