@hb_ Yes definitely. You are trying to implement something like new SDK, in fact. That's why I proposed this on the thread! To be more easy, at least for future. May be an easier way would be take a look on some existing SDK (on language familiar to you) and reimplement what's there (at least needed parts).
You're on the right track. That is, you can upload files to Dropbox using HTTPS requests to /2/files/upload, and you have the basic code to do so already.
It sounds like you're currently working on how to get the data from the local file system though, which isn't specific to Dropbox, so I'm afraid I can't offer much specific help with that in particular, nor do I have a code sample for that in particular. (I'm also certainly not a C expert.)
As I said, I will keep looking
Thank you for your time @Greg K.
As for DropBox I will be expecting an official C++ SDK soon
Edit: As a note I found a repo on github, a dropbox api c++ library that on looks seems to do what I want but I haven't figure the whole code out and get it to work
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