Uploading multiple files with firefox (mobile)

[jatentaki]

When I upload phone -> PC with firefox mobile and select multiple files at once, I instantly get a successful upload message but only some of the chosen files appear on my PC and are corrupt (0 bytes). It works fine with a single file as well as with chrome mobile.

Thanks a lot for the tool, it solves a big pain point for me :)

[mifi]

Hi. How big are the files you're trying to upload? and how many? and does it work with another browser?

[jatentaki]

Hi, I tried uploading anywhere between 1 and ~150 .jpg images about 2mb each. It works for a single one but not for more. It does work with chrome (as I stated above).

Thanks for your interest

[mifi]

Ok I managed to reproduce the problem. Firefox mobile does not properly send the multipart form like other browsers do.

When testing with two files...

Chrome mobile:

{
  'content-length': '522814',
  'content-type': 'multipart/form-data; boundary=----WebKitFormBoundaryBHWzyAyea9HBaafn',
  'accept-encoding': 'gzip, deflate',
}

Firefox mobile:

{
  'content-length': '230',
  'accept-encoding': 'gzip, deflate',
  'content-type': 'multipart/form-data; boundary=---------------------------116521216141164983863359111',
}

content-length is only 230.

I've googled a bit and tried to use fetch instead of axios but nothing seems to solve this issue on firefox mobile.

Maybe we need to upload files one-by-one

[mifi]

I just tested with firefox on mac, and it works. So it's definitely a firefox mobile issue

[neffets]

Again with Android-FF with at least version 131.0.1 and 132.0.1

Form is defined as:
<form action="/test/formular.93992.php" method="post" id="form_1" class="form" enctype="multipart/form-data">

Input defined as:
<input class="form-check-input" type="file" name="input_1_3" required="required" title="Upload" accept=".docx, .pptx, .xlsx, .pdf">

try to send an 1MB file, the request has only 12kBytes with this headers:

POST /test/beispielseiten/formulare/formular.93992.php HTTP/2
Host: stg.XXX.YY
User-Agent: Mozilla/5.0 (Android 15; Mobile; rv:132.0) Gecko/132.0 Firefox/132.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-DE,en-US;q=0.7,ru-RU;q=0.3
Accept-Encoding: gzip, deflate, br, zstd
Referer: https://stg.XXXX.YY/test/formular.93992.php
Content-Type: multipart/form-data; boundary=---------------------------395248176313172189901482212775
Content-Length: 0
Origin: https://stg.XXX.YY
Connection: keep-alive
Cookie: PHPSESSID=mct6ko3rl5t9ig6rnhqj268rcu; dst_zones=; tz_info=; AAAAAAAAAA=52616e646f6d4956e244cea25f5ecef82778783b0735d51de50babfc073546286d3c745fbf95056cc9702afc679b8eff; session_info=%7B%22srvts%22%3A%201730975540%2C%20%22ttl%22%3A%2032400%7D; tz_info_saved=1730975542; wt_rla=102571513503709%2C2%2C1730975546347
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Priority: u=0, i
TE: trailers
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