I believe this is what you're looking for:
https://community.acer.com/t5/Swift-Spin-S-and-R-Series/Aspire-r5-571t-R15-Mystery-Port/td-p/461136
There is an empty m.2 slot available, so you can have both an hdd and an ssd installed at the same time.
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Re: How do you add an ssd in a R5-571T-59DC?
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