On the new iPadOS update, the iPad was able to connect to external storage devices. Support reading data directly on external memory, not necessarily copy to the computer, read many types of text formats, images, and even running a movie is okay. Everything is managed by application Files available on the computer, to understand more about Files you read this article: How to use and set up App Files to manage files on iCloud, Google Drive, OneDrive
Most of the current external storage devices that I try can be received, you can quickly see documents, or certain movie files. You can also temporarily copy the device memory in an area where the Files are available for you.
The formats that the iPad supports reading are similar to Macs, so if you want to read NTFS-formatted hard drives, please condolences.
Types of popular formats that the iPad will read, NTFS I try not read (Should use eXFAT to read both on Mac and Win).
The interface of Files, on the left is the main Menu. On the right is the data interface of the external hard drive I have connected, it displays as Folder like on the computer.
Options for 1 File on external memory.
Identify File Office, even Unzip without needing to add other supported applications.
Read delicious Powerpoint files.
Read PDF files well.