Upload with correct content_type
When uploading data, try to get the content_type right :

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Marianne_2.png
was uploaded with aws s3 cp Marianne_2.png s3://bucket/
-
a70331df7b0bcc42c62404073957d6bc6018ad72_Marianne_2.png
was uploaded by s3storage
To upload designs, you'll need to enable LFS and have an admin enable hashed storage.
More information