The endpoint blob file is not having any extension of the files example .pdf, .txt, .docx and etc.
the required option is not enabled.
for the option you can navigate (sample screenshot and steps below) to select the option you required to enable.
Central Administration> Application Management>Storage Profiles>(profilescope of the respected storageprofile)
Sample screenshot of Profile Endpoint configuration
** The changes would not be applied to existing externalized blob.
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