Connect almost everything you've always wanted to your iPad Pro with the HyperDrive USB Type-C Hub from Sanho. The 2018 iPad Pro features a USB Type-C port, which widens its compatibility with other devices. The HyperDrive features an HDMI port that supports up to a 4K display, an SD card reader, a 3.5mm audio jack, as well as USB 3.1 Gen 1 Type-A and Type-C ports. A removable grip is included with the hub to help separate it a bit from the iPad, making it compatible with cases and other accessories.
Please note that while this adapter does support 4K 30 Hz HDMI output as well as 60W power delivery via Type-C, these values will be 2K 60 Hz and 30W respectively when used with the iPad Pro.