Share link file drop gets "Could not upload ..."

[MrTinnysis]

Steps to reproduce

1. Create "new folder"
2. Create "share link" with setting "file drop (upload only)"
3. Visit created link and select or drop a file

Expected behaviour

File gets uploaded to the shared folder. Activity shows "Created by file upload" or something similar.

Actual behaviour

File gets uploaded to the shared folder, BUT uploader gets a "Could not upload "DSC_0452.jpg"" notification and icon in "uploaded files" is changed to error.svg.

Server configuration detail

Operating system: Linux 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64

Webserver: Apache/2.4.38 (Debian) (apache2handler)

Database: pgsql PostgreSQL 13.0 on x86_64-pc-linux-musl, compiled by gcc (Alpine 9.3.0) 9.3.0, 64-bit

PHP version:

7.4.11 Modules loaded: Core, date, libxml, openssl, pcre, sqlite3, zlib, ctype, curl, dom, fileinfo, filter, ftp, hash, iconv, json, mbstring, SPL, PDO, session, posix, Reflection, standard, SimpleXML, pdo_sqlite, Phar, tokenizer, xml, xmlreader, xmlwriter, mysqlnd, apache2handler, apcu, bcmath, exif, gd, gmp, imagick, intl, ldap, memcached, pcntl, pdo_mysql, pdo_pgsql, redis, sodium, zip, Zend OPcache

Nextcloud version: 20.0.0 - 20.0.0.9

Updated from an older Nextcloud/ownCloud or fresh install: 18.04 -> 19.10 -> 20

Where did you install Nextcloud from: unknown

Signing status

Array ( )

List of activated apps

Enabled:
 - accessibility: 1.6.0
 - activity: 2.13.1
 - bruteforcesettings: 2.0.1
 - cloud_federation_api: 1.3.0
 - comments: 1.10.0
 - contactsinteraction: 1.1.0
 - dashboard: 7.0.0
 - dav: 1.16.0
 - federatedfilesharing: 1.10.1
 - federation: 1.10.1
 - files: 1.15.0
 - files_pdfviewer: 2.0.1
 - files_rightclick: 0.17.0
 - files_sharing: 1.12.0
 - files_trashbin: 1.10.1
 - files_versions: 1.13.0
 - files_videoplayer: 1.9.0
 - firstrunwizard: 2.9.0
 - issuetemplate: 0.7.0
 - logreader: 2.5.0
 - lookup_server_connector: 1.8.0
 - nextcloud_announcements: 1.9.0
 - notifications: 2.8.0
 - oauth2: 1.8.0
 - password_policy: 1.10.1
 - photos: 1.2.0
 - privacy: 1.4.0
 - provisioning_api: 1.10.0
 - recommendations: 0.8.0
 - serverinfo: 1.10.0
 - settings: 1.2.0
 - sharebymail: 1.10.0
 - support: 1.3.0
 - survey_client: 1.8.0
 - systemtags: 1.10.0
 - text: 3.1.0
 - theming: 1.11.0
 - twofactor_backupcodes: 1.9.0
 - updatenotification: 1.10.0
 - viewer: 1.4.0
 - workflowengine: 2.2.0
Disabled:
 - admin_audit
 - encryption
 - files_external
 - user_ldap
 - user_status
 - weather_status

Configuration (config/config.php)

{
    "htaccess.RewriteBase": "\/",
    "memcache.local": "\\OC\\Memcache\\APCu",
    "apps_paths": [
        {
            "path": "\/var\/www\/html\/apps",
            "url": "\/apps",
            "writable": false
        },
        {
            "path": "\/var\/www\/html\/custom_apps",
            "url": "\/custom_apps",
            "writable": true
        }
    ],
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "nextcloud.laettere.ch"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "pgsql",
    "version": "20.0.0.9",
    "overwrite.cli.url": "http:\/\/nextcloud.laettere.ch",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "theme": "",
    "loglevel": 2,
    "maintenance": false
}

Are you using external storage, if yes which one: no

Are you using encryption:

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Operating system: Windows 10

Logs

Web server error log

Nextcloud log

[PHP] Error: Error: Cannot modify header information - headers already sent by (output started at /var/www/html/3rdparty/sabre/http/lib/Sapi.php:132) at /var/www/html/apps/dav/lib/Connector/Sabre/File.php#691 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError(2, "Cannot modify h ... )", "/var/www/html/a ... p", 691, {string: "X-Hash ... "})
 1. /var/www/html/apps/dav/lib/Connector/Sabre/File.php line 691
    header("X-Hash-MD5: ced ... f")
 2. /var/www/html/apps/dav/lib/Connector/Sabre/File.php line 189
    OCA\DAV\Connector\Sabre\File->header("X-Hash-MD5: ced ... f")
 3. <<closure>>
    OCA\DAV\Connector\Sabre\File->OCA\DAV\Connector\Sabre\{closure}("*** sensitive parameters replaced ***")
 4. /var/www/html/lib/private/Files/Stream/HashWrapper.php line 71
    call_user_func(Closure {}, "*** sensitive parameter replaced ***")
 5. <<closure>>
    OC\Files\Stream\HashWrapper->stream_close()
 6. /var/www/html/3rdparty/icewind/streams/src/Wrapper.php line 132
    fclose(null)
 7. /var/www/html/lib/private/Files/Stream/HashWrapper.php line 75
    Icewind\Streams\Wrapper->stream_close()
 8. <<closure>>
    OC\Files\Stream\HashWrapper->stream_close()
 9. /var/www/html/3rdparty/icewind/streams/src/Wrapper.php line 132
    fclose(null)
10. /var/www/html/lib/private/Files/Stream/HashWrapper.php line 75
    Icewind\Streams\Wrapper->stream_close()
11. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 319
    OC\Files\Stream\HashWrapper->stream_close()
12. /var/www/html/apps/dav/appinfo/v1/publicwebdav.php line 113
    Sabre\DAV\Server->exec()
13. /var/www/html/public.php line 81
    require_once("/var/www/html/a ... p")

PUT /public.php/webdav/DSC_0452.jpg
from 85.195.235.52 at 2020-10-13T15:23:18+00:00

Browser log