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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2):
Operating system and version (eg, Ubuntu 17.04):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):
The issue you are facing: Pixelmator native files are not being saved/displayed correctly. The native files shows up as a .pxd “folder”. Within the folder are three items: data (folder), Quicklook (folder), metadata.info. It should be just one Pixelmator file.
Is this the first time you’ve seen this error? (Y/N): N. I happens with every upload of a Pixelmator file across the board.
Steps to replicate it:
- Save a native Pixelmator file.
- Upload it to my Nextloud directory
Additional Information: I can right-click and download the “folder” (should be a file) and it downloads as a zip file. I can unzip it and see and work with the native file. Just seems like an unnecessary step and I get no preview in NextCloud. Awkward.
The output of your Nextcloud log in Admin > Logging:
PASTE HERE - Can't find where ti execute this command
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE - Can't figure out how to do this
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE I am not an admin of the web server.