Sorry to say but since the s21 doesn't have a Sd card slot you would need to use google or onedrive for cloud storage
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How much storage do you have 128GB or 256? What's using up all of your storage? If it's media (pictures, videos, documents etc) you can connect your phone to a computer and offload it to the computers hard drive or an external drive. If it's all apps, you will have to delete some of your apps or the data in some of the apps. It is a bumnner that Samsung no longer offers an SD card slot for even more storage.
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