I changed the 128gb SSD (brand: Samsung) inside my early 2015 13” MBAir for a larger one from OWC. Functions as expected.

BUT: the 128gb SSD (from Samsung) does NOT retain information when used inside the OWC Envoy housing . . Conclusion: I own one 128gb SSD and one ENVOY, both useless . . .

OWC, since their website contains (incomplete) info about compatibility of Apple SSD’s, can’t do anything for me. My reseller states he did not know about the issue. Ergo . . no more OWC for me.