1.13.x branch. The cover uses .jpg, but avatar uses .jpeg. I think both should be valid.
Uploads. No subdirectories for uploaded images
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When an image is uploaded by a user, it is placed in one folder /public/uploads/files.
However, a folder can often contain a limited number of files and directories, say 64,000. And searching for a file is slower when there are many files in a directory.Usually, uploaded files are placed into subdirectories:
/a/a1111
/a/a1112
...
/b/b1111
...
/c/c6565
...