Converting a 2 page PDF to PNG, creates 2 png files, but they cannot be downloaded

[Jomack16]

Describe the bug
Converting a 2 page PDF creates 2 PNG files, but the download option only shows one file, and it does not download.
I've noticed that the PNG files are created, but they have names like filename-0.png and filename-1.png
The download and view links reference a file called filename.png which matches the uploaded filename.pdf, but is incorrect when trying to serve the files for view and download.

To Reproduce
Steps to reproduce the behavior:

1. Upload 2 page PDF file called filename.pdf
2. Click Search for conversions
3. Type PNG
4. select the png option from imagemagick
5. click convert
6. Click the View or Download button on the results page
7. View will say "something went wrong!"
8. Download will open a new tab with "Problem loading page"

Checklist:

• I am accessing ConvertX over HTTPS or have HTTP_ALLOWED=true