Problematic filename pattern characters

Some clients' filesystem have limited filename/characters allowed. We document here on which OS/device which pattern/characters are not allowed. When any client is automatically creating a new file (e.g. via camera upload feature on Android Files/Talk), please make sure to only created allowed filenames.

Android:

• "?" at end
• ":", "<", ">"

Windows:

• " " (whitespace) at end of folder name
• "." (dot) at the end of a file/folder name
• "" as part of folder/file name
• "/" as part of folder/file name
• ":" as part of folder/file name
• "*" as part of folder/file name
• "?" as part of folder/file name
• """ as part of folder/file name
• "<", ">" as part of folder/file name
• "|" as part of folder/file name