Question attachment image size exceed limit allowed by configuration

I know this issue seems to recur, and have tried what I can.
I've made sure that the avatar image max size and the file upload max size , and the image upload size are all identical.
I have checked my main menu link to the forum id of type menu item alias


I would be grateful please for a pointer what to try next.

Thank you

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Third-party components: CommunityBuilder 2.1.3

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Still struggling with this issue - grateful for any help please
Am trying to run the update to K5.1 but having problems with that as well "invalid extension update" (separate topic created)
I'm hoping that maybe when the second of these issues is solved the first issue will go away as well!