Issue #3526079: Allow attachments in media processor

Closes #3526079

added 1 commit

• 617c849d - Add unit test coverage.

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added 3 commits

• 6e60dc7f - 1 commit from branch project:9.1.x
• 583c27e6 - Fix warnings.
• 954982ef - Merge branch '9.1.x' into 3526079-allow-attachments-in

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added 1 commit

• 946c0c00 - Issue #3526079: Allow cache tags and contexts to be set from the media processor

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added 21 commits

• 946c0c00...cd1f518a - 20 commits from branch project:9.1.x
• 39fbed59 - Merge remote-tracking branch 'origin/9.1.x' into 3526079-allow-attachments-in

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