GTA and a bunch of other games on Xbox I run without problems. I have an old system and I've run out of memory so I'm using one of these to save games. No problem. I would recommend this route if you don't want to upgrade your system until late 2020/early 2021 when new systems come out.
2 TB External HDD ADATA DashDrive Durable HD650, USB 3.2 Gen 1, Blue
55 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
π SAMSUNG T5 Portable SSD 2TB - High-Speed USB 3.1 External Solid State Drive, Black (MU-PA2T0B/AM)
40 Review
Samsung T5 Portable SSD MU PA500B
88 Review
π StarTech.com 3.5in Silver Aluminum USB 3.0 External SATA III SSD / HDD Enclosure with UASP - Portable USB 3 3.5" SATA Hard Drive Housing (S3510SMU33)
10 Review
SAMSUNG T7 Portable SSD 1TB: Fast and Reliable USB 3.2 External Solid State Drive in Gray
13 Review