Upload multiple files in session

Hi MatthiD

You can definitely just start an upload session and then finish it, without needing to use `filesUploadSessionAppendV2`. 

Looking at the code snippet provided, it looks like you are starting an upload session by calling `filesUploadSessionStart()`, but are attempting to finish that same session by calling `filesUploadSessionFinishBatchV2()`. While this technically does work — `filesUploadSessionFinishBatchV2()` will finish an upload session started with `filesUploadSessionStart()` — you may want to use one of the following combinations:

• `filesUploadSessionStart()` and `filesUploadSessionFinish()`
• `filesUploadSessionStartBatch()` and `filesUploadSessionFinishBatchV2()`

Keep in mind that `filesUploadSessionStart()` is meant to upload a single file, whereas `filesUploadSessionStartBatch()` starts a batch of upload sessions.

Additionally, since there is no functionality to separate the files, please ensure you are not combining all of the file data of multiple files into one large buffer — use one upload session per file needing to be uploaded.

To answer your additional questions:

• An upload session is a temporary process that allows large files to be uploaded in smaller chunks instead of a single request.
• An entry is information pertaining to a file in the batch of files.
• Could you clarify what you are wanting to achieve by "accessing one session from multiple entries"?

Lastly, the error you are receiving means:

The specified offset was incorrect. See the value for the correct offset. This error may occur when a previous request was received and processed successfully but the client did not receive the response, e.g. due to a network error.

The "correct_offset" value from the response you provided means that the Dropbox API had only received 257523 bytes for the upload session so far. The error "incorrect_offset" was thrown because the Dropbox API received a value other than 257523 in your request.

Feel free to take a look at this example for an idea of how an upload session can be handled.

For best practices when uploading files via the Dropbox API, please refer to our Performance Guide.