To test support of special characters in document names we created test files and uploaded them to document library:
When we try to open such file, an error message appears:
Of course, the file is valid JPG, which can be viewed very fine in the same SharePoint instance under another name. Preview breaks only when the file is renamed.
Is it a bug of SharePoint? What characters are allowed in file names to enable preview?
Any advice will be highly appreciated. Thank you.