Support for serving source files and other attachments from a CDN

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: peachjam/models/core_document_model.py

Function	Unhandled Issue
save	ValueError: No configuration for prefix BONIFACE DAVID KANGOLI v. THE ZANZIBAR COLLECTION M in settings.DYNAM... ... Event Count: 3

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