GitHub user videni added a comment to the discussion: How to use opendal to 
implement  breakpoint resume upload and   Incremental upload ?

> > if so, at client side( a mobile device for example), one must upload all 
> > data again to our server, is this right ? Any workaround please?
> 
> One common architecture for cloud storage-based applications involves the 
> backend maintaining a database with a table mapping files to blocks (which 
> contain the paths to storage). This way, the storage service only holds raw 
> data blocks without any business logic. The backend is responsible for 
> calculating the differences and determining the data the client needs to send.

I see, thanks for the tips.  However, keeping the upload id in our server, the 
multipart upload would be more performant I think,  hope this can be 
implemented soon. I will try some dirty hacks for now. 

GitHub link: 
https://github.com/apache/opendal/discussions/5875#discussioncomment-12611291

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