Dear Phany,
A storage system only supports 2.5-inch SSDs that match the system model. SSDs that do not match the storage system or are not certified by Huawei cannot be used.
1. Wear an ESD wrist strap, ESD gloves, and ESD clothes.
2. Take the 2.5-inch SSD to be installed out of the ESD bag.
3. Insert the 2.5-inch SSD into an empty slot and close the handle after the SSD clicks into place, as shown in Figure 2.
Install 2.5-inch SSDs in sequence of the slot numbers. Disk slots of a storage device are numbered 0 to 24 from left to right, as shown in Figure 1.
Figure 1 Numbers of disk slots

Figure 2 Installing a 2.5-inch SSD

Thanks.