Error when citing large pdf sources

My bot has hundreds of sources which are actually FDA guidances and are large pdf documents, often around 40 pages long, but some longer. These have been ingested via the google drive integration and are being cited in responses. However, when they are cited, the link to the pdf appears beneath the quote, and the modal pops up and says “no content available” and an error pops at the top of the screen saying “Failed to load source content”.
For us these are cited on a majority of responses, so the occurrence of that error is quite common. everything works right up to the point of displaying that cited source.