Uploading from external HD does not create folders

[M.P. Korstanje]

I'm trying to upload a directory (with files and subdirectories) from an external USB HD. FileZilla doesn't create the directory structure. This results in a failure of the upload. When trying to upload the same files from the local drive everything works.

I have this structure locally:

C is the local Drive, F the external USB HD.

C:/folder/file.txt
F:/folder/file.txt

I have this structure remotely:

/

The action I've tried:

1. Local F:/folder --Drag--> Remote / : fails
2. Remote make directory folder/ and local F:/folder/file.txt --Drag--> remove /folder : works
3. local C:/folder --Drag--> remote / : works
4. local F:/folder/file.txt --Drag--> remote / : works

I hope this is sufficient information.

[M.P. Korstanje]

This also works:

5. Remote make directory folder/ and local F:/folder/ --Drag--> remote /folder : works

[M.P. Korstanje]

This too:

6. Remote make directory folder/ and local F:/folder/ --Drag--> remote / : works