Then you simply drag down and keep dragging down till you are done selecting all the messages you want or till you reach the end of the menu without taking your fingers off the screen at all.
How to Select Multiple Notes on iPhone/iPad with Two finger-Tap and Drag

The two finger-tap and drag feature is not just exclusive to email and messages application on the iOS device. It is equally applicable to the Notes app which is used by device owners to jot ideas, reminders, create checklists, scan and sign documents and even draw or even add attachments like weblinks, images and documents for themselves. It is very similar to the previous apps discussed above.
Begin by launching the Notes application on the home screen of your iOS device. When the application is opened, all notes that have been created and saved by you will be on your screen.
Now tap on any of the notes of your choice that has been listed with your two fingers simultaneously.
Without lifting any of the fingers, drag down quickly to start highlighting all the notes that are there. As you are doing this, you are selecting multiple notes at the same time.
How to Select Files on iPhone/iPad with Two finger-Tap and Drag

The Files application which is by default found on the second home screen on your iOS device envelopes all file services with apps like iCloud, Google Drive etc. It is a single point on your device from which you can access all documents, photos, etc.
The use of the Two finger-tap and drag feature will be very well needed here as there are usually a lot of files or folders in this app compartment.
Start by opening the Files App on your device. Go to any directory, there you will find different folders like Downloads, Documents etc, then you tap on one of the folders available there with your two fingers.
Quickly begin to drag down still with your two fingers without lifting them at all, either left or right to the selection menu. This will select multiple folders easily.
As with most smartphone gestures, the Two-finger tap and drag feature has many areas of application on the iPhone and iPad, and it’s up to you to make good use of them to make your day-to-day usage of your smartphone even easier, with the steps outlined above.
unsure why i cant access storage back up carrier services account etc ?