Unable to upload RAW image formats (.NEF, .DNG, etc.) anywhere in XF/XFMG/XFRM despite allowed extensions

[CrazyChef]

I'm running XenForo 2.3.9 with XFMG 2.3.9 and XFRM 2.3.8.

I'm trying to allow users to upload RAW camera files directly (.NEF, .DNG, .RAW, etc.), but the uploads never complete.

The upload simply sits at 0% indefinitely whether I try uploading:

• to XFMG
• as a normal forum attachment
• or into XFRM

Things I've already verified:

• upload_max_filesize = 256M
• post_max_size = 256M
• max_execution_time = 300
• memory_limit = 511M
• Cloudflare proxy disabled for testing...

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