[Lenovo Yoga Tab 3 Plus ROMs, Kernels, Recoveries, ] vladimiroltean:
Might I ask how you are checking exactly, when you say that USB storage doesn't work?

According to the log below, the system is able to identify and mount your USB device mighty fine.

08-04 20:57:01.040 390 396 V vold : DISK mbr
08-04 20:57:01.041 390 396 V vold :
08-04 20:57:01.042 390 396 V vold : PART 1 c
08-04 20:57:01.042 390 396 V vold :
08-04 20:57:01.044 1151 1298 D VoldConnector: RCV <- {650 public:179_65 0 "disk:179_64" ""}
08-04 20:57:01.044 1151 1298 D VoldConnector: RCV <- {654 public:179_65 sdcard1}
08-04 20:57:01.045 1151 1298 D VoldConnector: RCV <- {651 public:179_65 0}
08-04 20:57:01.045 1151 1298 D VoldConnector: RCV <- {643 disk:179_64}
08-04 20:57:01.046 1151 1298 D VoldConnector: RCV <- {200 3 Command succeeded}
08-04 20:57:01.047 1151 1297 D VoldConnector: SND -> {4 volume user_added 0 0}
08-04 20:57:01.048 1151 1298 D VoldConnector: RCV <- {200 4 Command succeeded}
08-04 20:57:01.050 1151 1297 D VoldConnector: SND -> {5 volume mount emulated 3 -1}
08-04 20:57:01.052 1151 1298 D VoldConnector: RCV <- {651 emulated 1}
08-04 20:57:01.052 1151 1298 D VoldConnector: RCV <- {656 emulated /data/media}
08-04 20:57:01.053 1151 1298 D VoldConnector: RCV <- {655 emulated /storage/emulated}
08-04 20:57:01.053 390 396 V vold : Waiting for FUSE to spin up...
08-04 20:57:01.105 1151 1298 D VoldConnector: RCV <- {651 emulated 2}
08-04 20:57:01.106 1151 1298 D VoldConnector: RCV <- {200 5 Command succeeded}
08-04 20:57:01.106 1151 1297 D VoldConnector: SND -> {6 volume mount public:179_65 2 0}
08-04 20:57:01.107 390 396 V vold : /system/bin/blkid
08-04 20:57:01.108 1151 1298 D VoldConnector: RCV <- {651 public:179_65 1}
08-04 20:57:01.108 390 396 V vold : -c
08-04 20:57:01.108 390 396 V vold : /dev/null
08-04 20:57:01.109 390 396 V vold : -s
08-04 20:57:01.109 390 396 V vold : TYPE
08-04 20:57:01.110 390 396 V vold : -s
08-04 20:57:01.110 390 396 V vold : UUID
08-04 20:57:01.111 390 396 V vold : -s
08-04 20:57:01.111 390 396 V vold : LABEL
08-04 20:57:01.112 390 396 V vold : /dev/block/vold/public:179_65
08-04 20:57:01.159 390 396 V vold : /dev/block/vold/public:179_65: LABEL="UsbStorage" UUID="7667-141B" TYPE="vfat"
08-04 20:57:01.159 390 396 V vold :
08-04 20:57:01.165 390 396 V vold : /system/bin/fsck_msdos
08-04 20:57:01.166 390 396 V vold : -p
08-04 20:57:01.166 390 396 V vold : -f
08-04 20:57:01.166 390 396 V vold : /dev/block/vold/public:179_65
08-04 20:57:01.168 1151 1298 D VoldConnector: RCV <- {652 public:179_65 vfat}
08-04 20:57:01.168 1151 1298 D VoldConnector: RCV <- {653 public:179_65 7667-141B}
08-04 20:57:01.169 1151 1298 D VoldConnector: RCV <- {654 public:179_65 UsbStorage}
08-04 20:57:01.169 1151 1298 D VoldConnector: RCV <- {656 public:179_65 /mnt/media_rw/7667-141B}
08-04 20:57:01.169 1151 1298 D VoldConnector: RCV <- {655 public:179_65 /storage/7667-141B}
08-04 20:57:01.191 1472 1472 D fsck_msdos: sectors Per cluster :64
08-04 20:57:01.191 1472 1472 D fsck_msdos: boot->ClusterOffset :29504
08-04 20:57:01.191 1472 1472 I fsck_msdos: FAT32 Filesystem
08-04 20:57:01.191 1472 1472 D fsck_msdos: Using cluster_chain_descriptor
08-04 20:57:01.191 1472 1472 I fsck_msdos: Total clusters 1891091
08-04 20:57:01.284 1151 1151 D NetworkPolicy: setRestrictBackgroundUL(): false
08-04 20:57:01.405 1472 1472 I fsck_msdos: ** Phase 2 - Check Cluster Chains
08-04 20:57:01.405 1472 1472 I fsck_msdos: Begin to handle the cluster chain
08-04 20:57:01.505 390 396 I Vold : Filesystem check completed OK
08-04 20:57:01.528 390 396 V vold : Waiting for FUSE to spin up...
08-04 20:57:01.576 1151 1151 I SystemServiceManager: Starting phase 600
08-04 20:57:01.580 1151 1298 D VoldConnector: RCV <- {651 public:179_65 2}
08-04 20:57:01.580 1151 1298 D VoldConnector: RCV <- {200 6 Command succeeded}

I notice you also installed the JS USB OTG Trial application. I have absolutely no clue what that does, but I can assure you it's not needed. You should be able to access your USB storage from the preinstalled file manager application.

One last thing:

W vold : type=1400 audit(0.0:30): avc: denied { getattr } for path="/data/adb/magisk.img" dev="mmcblk0p49" ino=384287 scontext=u:r:vold:s0 tcontext=u:object_r:adb_data_file:s0 tclass=file permissive=0

I probably shouldn't even be debugging this any further until you can prove the issue still occurs without Magisk and any other bloatware installed.

EDIT (unrelated): The log you just sent isn't from the latest build, is it? I notice these errors that should have been fixed a long time ago:

E qti_sensors_hal: yhj check open /userstore/adjustsensor_x_x failed(No such file or directory)