Photos lost. Showing as grey exclamation marks.

Had camera set on SD card for storage. For some reason photos I have taken are now showing as a grey exclamation mark. When I check the file on the SD card they say zero KB. The thing is I edited some of the photos after I took them so I know they were there. Have tried encrypting the SD card but nothing changed. Please help. Lost some important memories.
Thanks in advance

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