This has been occurring for well over a month now back to 2.10's release and is still going on after I updated to 2.10.2 today.

When we attach a PDF file to a K2 article it uploads fine but then it changes the filename from filename.pdf to filename.txt. See the attached image to see what I mean. This worked fine prior to 2.10!

Any idea what is going on? I see there are other posts on here about this same issue...

Also, here is a quick video showing what I am talking about.

drive.google.com/file/d/1_xZBD0uUY_A5vNdBJ9y0z5Bu4xu4ve8D/view

I also tried updating to the 2.10.3 dev release and the problem persists.

Thank you for the reply, but can you help clarify a bit for me? I maintain the server but am not aware of any changes recently that I made that would have fiddled with this beyond routine cpanel and kernel updates. Any idea what path I would take to troubleshoot this MIME type issue?

Apache with cpanel

It's just a stock cpanel server. No changes were made when setting it up other than installing cpanel and doing yum updates. It does have cpanel kernelcare installed on it but other than that nothing special. Cpanel version is the most recent one. It just updated the other day. Centos 7.7.

What other info would help and I will try to get it?

I discovered a similar issue today when trying to attach an MP3 to my Item. I manually fixed the problem by:
1) after uploading using the attachment screen, I renamed the file (using FTP) from .txt to .mp3 (attachment files are stored in /media/k2/attachments); and
2) editing the corresponding record in the ___k2_attachments mySQL table, changing the file extension on the file name from .txt to .mp3 as well.

I've only attached PDFs to my other articles recently, and have had no issues with the PDFs being renamed. I'm running of a Linux/Apache/cPanel server hosted by A2Hosting.com.

Fotis wrote: Try commenting out this line: github.com/getk2/k2/blob/master/administrator/components/com_k2/models/item.php#L439
Let me know.

I've commented out Line 439 [ $handle->file_new_name_body = JFile::stripExt($filename); ]
The file is not only still saved as a txt file, but also renamed with a random file name (see attached screen clipping; you can see the original file name maintained in the download link).

I've been using K2 for many years but I'm also now having this same issue since updating to the most recent version. My issue is when I upload mp3s which are turned to .txt files. Was there any further solution at all? I've spoken to my hosting company and they've said everything is fine their end. Many thanks.

Thanks Fotis, I made the change but this resulted in the file not uploading at all. The attachment details were still added to the database but without a file name.

Here's the log from the upload class in case it's helpful...

system information
- class version : 0.34dev
- operating system : Linux
- PHP version : 7.3.18
- GD version : 2.1.0
- supported image types : png jpg gif bmp
- open_basedir : no restriction
- upload_max_filesize : 8M (8388608 bytes)
- language : en_GB
source is a local file /tmp/phpDsPdnR
- local file OK
determining MIME type
- Checking MIME type with Fileinfo PECL extension
Fileinfo PECL extension not available
- Checking MIME type with UNIX file() command
MIME type detected as audio/mpeg; charset=binary by UNIX file() command
- MIME validated as audio/mpeg
source variables
- You can use all these before calling process()
file_src_name : phpDsPdnR
file_src_name_body : phpDsPdnR
file_src_name_ext :
file_src_pathname : /tmp/phpDsPdnR
file_src_mime : audio/mpeg
file_src_size : 1956870 (max= 8388608)
file_src_error : 0
process file to /public_html/media/k2/attachments/
- file size OK
- script renamed as phpDsPdnR.txt!
- file mime OK : text/plain
- new file name body : isnt-she-lovely
- destination variables
file_dst_path : /public_html/media/k2/attachments/
file_dst_name_body : isnt-she-lovely
file_dst_name_ext : txt
- no auto_rename if same filename exists
- destination file details
file_dst_name : karlo-isnt-she-lovely.txt
file_dst_pathname : /public_html/media/k2/attachments/isnt-she-lovely.txt
cleanup
- delete temp file /tmp/phpDsPdnR

Thanks so much for your efforts, this has solved the issue for me.