Validate file extension for display PDFs and add file versioning
Context
As reported in #986 (comment 102856)
Files uploaded to the 'Display PDFs' section must have a '.pdf' or '.PDF' file extensions.
Files should be versioned [@lathrops1 to provide more detail on how Display PDF files should be versioned. Should filename be taken into account when versioning? Does the requirement differ depending on submission type and conversion workflow?]
Proposal
Design
Implementation (if applicable)
Alternative approaches (if applicable)
Scheduling
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This feature is required for Priority 1: Deploy MVP -
This feature is required for Priority 2: Deploy Fully Production-Ready BCMS with All content migrated, some power users onboarded