Naming files and attachments

File names can be up to 255 characters long, including any file name extension. You can use either uppercase or lowercase letters in file names. File names preserve the case that you use when you create the file name, but the file names are not case sensitive.

Some characters that are available on your keyboard can cause unexpected results if they are used in file names. Do not use these characters when you name files, whether or not you are attaching the file to an e-mail message, cell, or record.

Invalid characters for file names