Already uploaded file if upload again / in a different path will show upload failed

[skygunner]

Describe the bug
Already uploaded file if upload again in the same path or in a different path will show upload failed;

To Reproduce
upload a file.
Upload the same file in same path or different path.

Expected behavior
If same path, show its already uploaded; Ideally compare the file hash/size/mod time etc.

If different path, use a reference to the same file previously uploaded file. When deleting file,
only the last reference deletion will actually delete the file from cloud.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.