There are errors in detecting your external SSD. Due to the time delay it is not automatically mounted:
[ 1.685265] usb 4-1: new SuperSpeed Gen 1 USB device number 2 using xhci-hcd
[ 1.706852] usb 4-1: New USB device found, idVendor=174c, idProduct=1153, bcdDevice= 1.00
[ 1.706876] usb 4-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 1.706890] usb 4-1: Product: Ugreen Storage Device
[ 1.706902] usb 4-1: Manufacturer: Ugreen
[ 1.706914] usb 4-1: SerialNumber: 26A1EE8393E4
[ 1.715808] scsi host0: uas
[...]
[ 33.775391] sd 0:0:0:0: tag#17 uas_eh_abort_handler 0 uas-tag 2 inflight: CMD IN
[ 33.775428] sd 0:0:0:0: tag#17 CDB: opcode=0x9e, sa=0x10 9e 10 00 00 00 00 00 00 00 00 00 00 00 20 00 00
[ 33.802274] scsi host0: uas_eh_device_reset_handler start
[ 33.926055] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci-hcd
[ 33.945820] scsi host0: uas_eh_device_reset_handler success
[ 33.962119] sd 0:0:0:0: [sda] 234441648 512-byte logical blocks: (120 GB/112 GiB)
[ 33.962891] sd 0:0:0:0: [sda] Write Protect is off
[ 33.962910] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 33.964012] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 33.964931] sd 0:0:0:0: [sda] Optimal transfer size 33553920 bytes
[ 33.994086] sda: sda1
[ 33.997500] sd 0:0:0:0: [sda] Attached SCSI disk
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Try to disable UAS with usb-storage.quirks=174c:1153:u kernel parameter.