4th Generation and legacy network-connect Tablo DVRs allow streaming to compatible devices anywhere in your home. However, there is no method to copy/save/export recorded Tablo video onto a device for later offline viewing.
Furthermore, Tablo recordings on external hard drives are not saved in a standard file format and therefore are not playable on other devices.
Network-connected legacy Tablo DVRs do have access to Tablo Connect, which allows out-of-home streaming. However, the recordings themselves stay on your home network and you must have a stable internet connection to access them.
Tablo 4th Generation DVRs do not have access to Tablo Connect.