Why Can’t I Attach Files in Yahoo Mail
When you attach an important document to an email in yahoo mail, a loading style progress bar and an “Adding an attachment� message help you to track the process of attaching file. Sometimes, Yahoo mail create problem while attaching a file and there might be lot of reason behind it. At Yahoo Support, we have discovered all those reason and provide an appropriate resolution to solve it.
When an attachment document will successfully attached, it should appear as a file name or image thumbnail at the lower side of the email with links for removing or downloading the attachment as needed. When you don’t see these indicator then the process might failed because of limitation set by yahoo browser or computer issues or interruptions on Yahoo's end.
Below are some reasons: File Restrictions Yahoo mail does not accept attachment with name that has special characters such as slashes, hashtags or dollar signs. If there is any file that contains any symbols or punctuation then remove them and try again. Yahoo has also restricted total message size to 25 MB. Yahoo guess that the encoding process that it uses to enable your email to be read by other email service providers can increase the size by approximately 33 percent, so your file can't actually be that big. There is no option for encrypted files.
Browser Problems Yahoo mail will not work properly unless you are using one of the approved browsers listed on the "Supported Browsers for Yahoo Mail". You also need to have the recent version of JavaScript and Adobe Flash enabled on your device. If you are using Internet Explorer then the compatibility mode can conflict with Mail and Yahoo recommends disabling it. if you will add ons such as ad-blocking extension then it can also cause problems. If you want to know more about Yahoo mails then you can Contact Yahoo number +64-04-8879113.
Original source