ProtonMail Beta PDF attachment preview broken unless Shields 100% down

Description of the issue: ProtonMail ( PDF attachment preview doesn’t work if Brave Shields are up (no matter whether fingerprinting protection and adblock are on or off). The content area of the page stays blank until Shields are completely disabled.
How can this issue be reproduced?

  1. Log into account on
  2. Open an email with a PDF attachment, click the attachment, observe that no preview is shown
  3. Do the same but with Shields fully disabled, observe that preview is shown

Expected result: see above

Brave Version( check About Brave): V1.24.85 (May 13, 2021)

Additional Information: Not tested with the non-beta version of ProtonMail (given we’ve been in public beta for ages now)

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