the same shared link cannot use somehow.

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koizpad wrote:

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I want to be able to update a file while maintaining the same Dropbox shared link. ...

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Hi koizpad,

Yes, that's the exact behavior when you update a file. 😉 You don't need to do anything more.

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koizpad wrote:

... However, when I replace it with another file with the same name, the link no longer works. ...

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Yes, that's expected behavior. The Dropbox link point to particular file, not to particular place in folders tree (like a symbolic link do)! Dropbox link is NOT a symbolic link and you shouldn't suppose/assume the same behavior. When you replace particular file you actually delete the old one and its link can alive as much as file resides still in Dropbox trash bin. Once it's permanently deleted (automatic or explicit), associated link "dies". In mean time the link does point to removed content, not to new one!

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koizpad wrote:

... The following discussion says it should work, so I guess Dropbox changed the policy? ...

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Hm..🤔 Such a behavior has never been and is not, so probably referred thread express some confusion. The problem comes from fact that many applications, when do file saving, replace old file to new file instead of update the file content (something end users don't notice but can impact the behavior of services like Dropbox). The link goes with file (not place) and once the file is gone, the link is gone too. Be careful what applications you are using to edit the files and if some application does replace instead of update (if not sure - try it), don't use it for edit into Dropbox folder. Web upload can be used in such cases (as workaround) but local update is possible too. 😉