My attachment symbol is not visible when I am sending an email. How do I get it back?

correct. You can't send as attachment from the stock mail App. If you start from the item you want to send (like a photo) and use the share feature, to email, it will embed the photo in mail . This is why I use Yahoo Mail App, so I can attach various items and multiple photos.

When you are composing an email tap at the location you want to insert a photo or video. The option to insert comes up. Tap on that and select the photo or video you wish to insert.

Alternately you can use the Photos app and select up to five photos to insert into an email. Tap select, select the photos and then tap the Share icon. Select Mail and an email will be created. You can then address the email, add a subject and type in content.

To attach other things like a PDF, Word Doc, etc. you need to use the app that creates or edit seize items. Again select the item you want to email and tap on the Share icon in the appropriate app.