Hi Mia, To specifically answer your question: the proper image size for a logo in a SharePoint online site is 180px wide by 64px high. Image format is commonly .png (since it supports an alpha channel/transparency), but I don't believe that's a firm requirement. I hope that helps! - Sean
I have managed to get the logo thumbnail to stick today by going to Site assets, deleting the existing "siteIcon.jpg " and then quickly uploading a new logo with the same file name and extension in Change the look > Header > Change site logo thumbnail. Bit of a phaff but it's sticking so far! Pngs are working for the site logo. Best wishes ...
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