What problem is this task about specifically? About issues with the uploading process or about displaying on Commons? How do you "manipulate it" exactly? What is the correct name and what is the incorrect name?

Or to summarize my questions: Could you please consider splitting your task description into sections like "Steps to reproduce, "Expected outcome" and "Actual outcome"?
That would make this task easier to understand... Thanks in advance.

The issue is that the accented name appears fine in links, popups etc. see the first image below, but when the exact same unicode text is used for a filename, it gets displayed as bad character marks on the Wikimedia Commons image page, see second image.

This may actually be a browser / OS font rendering issue issue -- on Mac OS X I see the boxes loading https://commons.wikimedia.org/wiki/File:Kosmos,_biblii%CD%A1a_prirody_-_sochinenie_A.N._Benera;_Perevod_s_ni%CD%A1emet%CD%A1skago_%281870%29_%2814801829943%29.jpg in Chrome but I see the combining character in Firefox.

If I go into the web inspector in Chrome and remove "Linux Libertine" from the font-family list for ".mw-body h1, .mw-body h2" selector, it starts rendering correctly. Note that I do not have a font called "Linux Libertine" on my system!

On more careful inspection it's not 'Linux Libertine' that's the problem but 'Georgia' (which was getting quasi-removed from the list during the backspacing of deleting 'Linux Libertine').

So.... evil Microsoft fonts. ;)

Yes, that makes sense. I've been using Chrome, and when I shift over to Firefox the Commons image page renders its Filename perfectly well.

Okay, in the light of the fact that 'Georgia' on Chrome is being naughty, yet on the same browser it will correctly display the name in links (presumably not using Georgia), is there a wider bug to be reported with implications for which font for displaying Commons image page file names is chosen for platform multi-language compatibility?

I am using Safari in my iPad, and my browser renders the filename correctly.

This is strange in Chrome. It renders correctly at the address bar and tabs, but not in the browsing screen.

I am using Google Chrome version 48.0.2564.116 (Official Build) m (32-bit), revision 700a0e589ecfa7e0f65cace17e2f75470c4adf9d-refs/branch-heads/2564@{#706}, and OS is Microsoft Windows XP Version 5.1.2600 SP3.