Can't see files uploaded in a folder?

Sorry if this is in the wrong place, or this doesn’t make sense?
I have uploaded 2 files in to a folder in assets.
But when I try to link to them from a webpage, they aren’t showing up. If I try and upload them again from that position, it tells me these files already exist, and will be named (1).
So they are in there! But I can’t see them...why?

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