Issue Summary

Some PDF attachments do not preview correctly in the browser. Affected PDFs display only a portion of the PDF. The same files open and display correctly in the Trello mobile app and when downloaded and opened.

Steps to Reproduce

1. Upload a PDF attachment to a Trello card

1. Open the card and click the PDF attachment to open the preview

1. Observe that portions of the PDF content are missing or not displayed

Expected Results

The PDF preview displays all content correctly, consistent with how the file appears when viewed as a downloaded file. 

Actual Results

The PDF preview opens but displays with significant portions of the content missing or blank. 

Workaround

Affected users can download the PDF attachment and open it locally using any PDF viewer, or view the attachment using the Trello mobile app, where the file displays correctly.