Blog Research Agent error

[Iscrisvesu]

Hello, since yesterday I have been having a problem with the Blog Research Agent. I want to run it, but it says, “File exceeds maximum allowed size or is unsupported file type. Try uploading another file.”

I haven't added any files.

Does anyone have any idea what's going on?

[RubenBurdin]

Hi @Iscrisvesu , you’re not doing anything wrong. I’ve seen this exact error pop up a few times with the Blog Research Agent, even when no file is uploaded.

What’s confusing is that the message mentions a file, but in practice it’s usually triggered by something else in the background. Because this agent is still in beta, HubSpot sometimes treats pasted content, long prompts, or even cached session data as an “upload,” which then fails validation. In a few cases, it was caused by a temporary backend hiccup rather than anything the user did.

A couple of quick things you can try before going to Support. First, open the agent in an incognito window or a different browser and try again with a very short prompt, just to rule out session or cache issues. Second, if you’re pasting a long topic description or keywords, try trimming it way down and rerunning it. That alone has resolved the error for some people.

That said, Bérangère’s advice is spot on. Since this is a beta feature, Community visibility is limited and Support has access to the internal error logs. They can usually confirm pretty quickly whether it’s a known bug, an account-level flag, or something they need to reset on the backend. If it’s a widespread issue, they’ll also log it directly with the product team. Annoying error message, but you’re not missing a hidden file upload step. Hopefully Support gets you unstuck fast.

[BérangèreL · Accepted solution]

Hi @Iscrisvesu, I hope that you are well!

Thanks for reaching out to the HubSpot Community!

Since the feature "Use the blog research agent" is still in Beta, I would recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real-time assistance for this matter, including hopping on a screenshare if necessary.

I hope that you'll get sorted soon!

Thanks so much and have a great day!
Bérangère