[Dropbox] all files from shared folder have the same ID

[legraphista]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.11.28
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

stefan@stefan:~$ youtube-dl -J https://www.dropbox.com/sh/7mxgomnzevsat6r/AACsKPzVkNmdPP2AfoCMfNTqa/test.1.mp4?dl=0 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-J', u'https://www.dropbox.com/sh/7mxgomnzevsat6r/AACsKPzVkNmdPP2AfoCMfNTqa/test.1.mp4?dl=0', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.11.28
[debug] Python version 2.7.17rc1 (CPython) - Linux-5.3.0-22-generic-x86_64-with-Ubuntu-19.10-eoan
[debug] exe versions: ffmpeg N-94691-gd59bd30842, ffprobe N-94691-gd59bd30842
[debug] Proxy map: {}
[debug] Default format spec: bestvideo+bestaudio/best
{"extractor": "Dropbox", "protocol": "https", "playlist_index": null, "playlist": null, "title": "test.1", "id": "7mxgomnzevsat6r", "webpage_url_basename": "test.1.mp4", "display_id": "7mxgomnzevsat6r", "format": "0 - unknown", "requested_subtitles": null, "format_id": "0", "url": "https://www.dropbox.com/sh/7mxgomnzevsat6r/AACsKPzVkNmdPP2AfoCMfNTqa/test.1.mp4?dl=1", "extractor_key": "Dropbox", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3596.0 Safari/537.36"}, "ext": "mp4", "webpage_url": "https://www.dropbox.com/sh/7mxgomnzevsat6r/AACsKPzVkNmdPP2AfoCMfNTqa/test.1.mp4?dl=0"}
stefan@stefan:~$ youtube-dl -J https://www.dropbox.com/sh/7mxgomnzevsat6r/AADBVievNsDEtuO03t7JMkena/test.2.mp4?dl=0 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-J', u'https://www.dropbox.com/sh/7mxgomnzevsat6r/AADBVievNsDEtuO03t7JMkena/test.2.mp4?dl=0', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.11.28
[debug] Python version 2.7.17rc1 (CPython) - Linux-5.3.0-22-generic-x86_64-with-Ubuntu-19.10-eoan
[debug] exe versions: ffmpeg N-94691-gd59bd30842, ffprobe N-94691-gd59bd30842
[debug] Proxy map: {}
[debug] Default format spec: bestvideo+bestaudio/best
{"extractor": "Dropbox", "protocol": "https", "playlist_index": null, "playlist": null, "title": "test.2", "id": "7mxgomnzevsat6r", "webpage_url_basename": "test.2.mp4", "display_id": "7mxgomnzevsat6r", "format": "0 - unknown", "requested_subtitles": null, "format_id": "0", "url": "https://www.dropbox.com/sh/7mxgomnzevsat6r/AADBVievNsDEtuO03t7JMkena/test.2.mp4?dl=1", "extractor_key": "Dropbox", "http_headers": {"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7", "Accept-Language": "en-us,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.96 Safari/537.36"}, "ext": "mp4", "webpage_url": "https://www.dropbox.com/sh/7mxgomnzevsat6r/AADBVievNsDEtuO03t7JMkena/test.2.mp4?dl=0"}

Description

You can see in the provided log, that both URLs generate the same ID, which is the ID of the folder
Folder: https://www.dropbox.com/sh/7mxgomnzevsat6r/AAA-wNChIhLHq5qXwEqMosjXa
File 1: https://www.dropbox.com/sh/7mxgomnzevsat6r/AACsKPzVkNmdPP2AfoCMfNTqa/test.1.mp4
File 2: https://www.dropbox.com/sh/7mxgomnzevsat6r/AADBVievNsDEtuO03t7JMkena/test.2.mp4

All of the above links generate id "id": "7mxgomnzevsat6r"