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hi guys i want buy this model macbook pro MJLQ2 2015 and made years is 2017 i want sure can i upgrade ssd ?i search more in internet and i can not find any answer thanks

Your system used a proprietary Apple PCIe-based blade SSD (PCIe 2.0 x4 interface). Presently OWC & Transcend are the only directly compatible third party SSDs both are PCIe 3.0 x2 drives. Here is a listing for Apples custom Samsung & Toshiba SSD’s The Ultimate Guide to Apple’s Proprietary SSDs They have the older PCIe 2.0 x4 drives.