Can't download/open attachments of older emails

Hi!

I'm having an issue downloading or opening attachments of emails that are a few months old. In the browser it's not a problem but on my phone I get an error that the file is damaged. Anyone having the same issue? I'm wondering if it's just a setting that I can't find. I'm not entirely sure where the cut is age-wise, but emails roughly older than 6-8 months are affected.

Thanks in advance!

Isabel