can our website`s users upload without create an account

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Esikhoob wrote:

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I think there is a third way. using your answer in https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/What-function-in-NET-SDK-is-for-oauth2-token/m-p/673861 , I can generate access token in .NET side (modified .NET`s SDK) and send them to Javascript side and use that to send file with help of Javascript`s SDK.

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Yes, it's always an option for everything, but in such a way you're exposing (despite of temporary) the access you granted to the end user (the passed access token can be caught). This way is only usable for "internal" use (i.e. in a set of users that you can rely on). Otherwise your system can be hacked very easy! 🤫

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Esikhoob wrote:

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Do you mean I can upload a file to a Dropbox`s shared link with help of Javascript`s SDK? I tried to upload a file to a Dropbox`s shared link using Postman software. As you can see in the attached picture, I get an error. 

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First of all, you're using preview link, not a shared one! Anyway, you cannot upload using any such link (preview or real shared link). As I said you need upload link - it's something different. Take a look here in the sources for details. 😉

Hope this sheds some more light.