Dimensions:
The max dimension pixel size for an image is roughly 288 height x 388 width.
How we determine which logo appears in reports/proposals:
If you change the partner’s logo but you aren’t seeing it on proposals or reports, the division-level logo could be taking precedence. If both are available we choose to show the division logo instead of the partner-level logo. You can add an advertiser logo. This would take precedence over the Partner and the Division logo.