Problems adding customised logo

I am trying to import a picture for my invoice logo, but even keeping well within the size parameters, it repeatedly says error. Has anyone else experienced this and did you manage to solve it please?
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Hi @Hazeldinka, logo issues may involve an incompatibility with the file type you are using.
Ryan goes over it in great detail here: https://community.waveapps.com/discussion/comment/11264#Comment_11264