WebDAV: Documents become folders on iOS Client

[cruiseflight]

This was reported first as https://central.owncloud.org/t/webdav-folder-sync-ios-readdle-documents-6-issue/10789.

My workaround was to keep using 9.1, which used to work just fine with all clients.

However, the Desktop Client 2.5.0 now forces you to upgrade the server to 10.0, as it flags all older versions as unsupported and automatically pauses synchronization.

The issue: When synchronizing a folder on an iOS device with the Readdle Documents WebDAV client, all folders and files show up. In the first level of the synced folder, files are fine. But files in any sub-folder show up as empty folders, not documents. The document contents can never be accessed.

Say you sync this folder structure:

MyDocs/
image1.jpg
sub/
image2.jpg

Then image1.jpg would be ok, but image2.jpg would show up as an empty folder the name image2.jpg.

All other features, including owncloud desktop client sync, works fine. The same iOS device syncs files and folders from an 8.1.5 or 9.1.8 just fine.

Steps to reproduce

1. Create a folder structure with subfolders.
2. Sync to Readdle Documents on iOS.
3. Check any document in a subfolder.

Expected behaviour

Documents should be documents.

Actual behaviour

Documents show up as empty folders.

Server configuration

Operating system:
Ubuntu 16.04.5 LTS

Web server:
Apache 2.4.18-2ubuntu3.9

Database:
MariaDB 10.0.36-0ubuntu0.16.04.1

PHP version:
PHP 7.0.32-0ubuntu0.16.04.1

ownCloud version: (see ownCloud admin page)
ownCloud 10.0.10 (stable)

Updated from an older ownCloud or fresh install:
fresh install

Where did you install ownCloud from:
http://download.owncloud.org/download/repositories/production/Ubuntu_16.04/

Signing status (ownCloud 9.0 and above):
No errors have been found.

The content of config/config.php:
https://gist.github.com/cruiseflight/b767b09691931325f378ae8135c52c70

List of activated apps:

  - activity: 2.3.8
  - calendar: 1.6.0
  - comments: 0.3.0
  - configreport: 0.1.1
  - contacts: 1.5.4
  - dav: 0.4.0
  - federatedfilesharing: 0.3.1
  - federation: 0.1.0
  - files: 1.5.1
  - files_external: 0.7.1
  - files_pdfviewer: 0.9.0
  - files_sharing: 0.11.0
  - files_texteditor: 2.2.1
  - files_trashbin: 0.9.1
  - files_versions: 1.3.0
  - files_videoplayer: 0.9.8
  - firstrunwizard: 1.1
  - gallery: 16.1.0
  - market: 0.2.5
  - notifications: 0.3.5
  - provisioning_api: 0.5.0
  - systemtags: 0.3.0
  - templateeditor: 0.3.1
  - updatenotification: 0.2.1
  - user_ldap: 0.11.0
Disabled:
  - encryption
  - external
  - user_external

Are you using external storage, if yes which one: local/smb/sftp/...
no

Are you using encryption: yes/no
LUKS

Browser Client configuration

Browser:
69.0.3497.81 (Official Build) Built on Ubuntu

Operating system:
Ubuntu 18.04

iOS Client configuration

Client:
Readdle Documents 6.6.1.562

Operating system:
iOS 11.4

Logs

Web server error log

no errors were logged when syncing the folder

ownCloud log (data/owncloud.log)

no entries were logged when syncing the folder

Browser log

no issue with the browser

[ownclouders]

GitMate.io thinks possibly related issues are #3008 (Problems with iFile iOS webdav client), #8322 (WebDAV permission attributes for desktop client), #3379 (FEATURE: Move Files in IOS client), #4463 (Webdav display issue / possible client resync / encryption issue?), and #16756 (Prevent WebDAV delete of user's files folder).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 10 days if no further activity occurs. Thank you for your contributions.