I'm not sure where to start to help you. You seem to have a lot if issues with disks:
Apr 11 07:34:18 SEDECORE dnsmasq-dhcp[8990]: DHCP, IP range 192.168.122.2 -- 192.168.122.254, lease time 1h
Apr 11 07:34:18 SEDECORE dnsmasq-dhcp[8990]: DHCP, sockets bound exclusively to interface virbr0
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: reading /etc/resolv.conf
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: using nameserver 71.10.216.1#53
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: using nameserver 71.10.216.2#53
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: using nameserver 192.168.0.1#53
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: read /etc/hosts - 2 addresses
Apr 11 07:34:18 SEDECORE dnsmasq[8990]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Apr 11 07:34:18 SEDECORE dnsmasq-dhcp[8990]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Apr 11 07:34:18 SEDECORE kernel: virbr0: port 1(virbr0-nic) entered disabled state
Apr 11 07:34:18 SEDECORE kernel: L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
Apr 11 07:39:22 SEDECORE dhcpcd[2224]: route socket overflowed - learning interface state
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Apr 11 07:44:00 SEDECORE root: Fix Common Problems Version 2021.04.10
Apr 11 07:55:06 SEDECORE kernel: isci 0000:05:00.0: sci_remote_device_frame_handler: in wrong state: STP_DEV_IDLE
Apr 11 07:55:06 SEDECORE kernel: sas: Enter sas_scsi_recover_host busy: 1 failed: 1
Apr 11 07:55:06 SEDECORE kernel: sas: ata9: end_device-7:2: cmd error handler
Apr 11 07:55:06 SEDECORE kernel: sas: ata7: end_device-7:0: dev error handler
Apr 11 07:55:06 SEDECORE kernel: sas: ata8: end_device-7:1: dev error handler
Apr 11 07:55:06 SEDECORE kernel: sas: ata9: end_device-7:2: dev error handler
Apr 11 07:55:06 SEDECORE kernel: sas: ata10: end_device-7:3: dev error handler
Apr 11 07:55:06 SEDECORE kernel: sas: --- Exit sas_scsi_recover_host: busy: 0 failed: 1 tries: 1
Apr 11 08:00:32 SEDECORE kernel: neighbour: arp_cache: neighbor table overflow!
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Apr 11 08:00:47 SEDECORE dhcpcd[2224]: route socket overflowed - learning interface state
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Apr 11 08:04:02 SEDECORE unassigned.devices: Removing configuration '//DS1/Downloads'.
Apr 11 08:04:12 SEDECORE kernel: net_ratelimit: 10 callbacks suppressed
Apr 11 08:04:12 SEDECORE kernel: neighbour: arp_cache: neighbor table overflow!
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Apr 11 08:04:25 SEDECORE dhcpcd[2224]: route socket overflowed - learning interface state
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Apr 11 08:14:28 SEDECORE kernel: neighbour: arp_cache: neighbor table overflow!
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Apr 11 08:14:33 SEDECORE dhcpcd[2224]: route socket overflowed - learning interface state
Apr 11 08:54:34 SEDECORE kernel: isci 0000:05:00.0: sci_remote_device_frame_handler: in wrong state: STP_DEV_IDLE
Apr 11 08:54:34 SEDECORE kernel: sas: Enter sas_scsi_recover_host busy: 1 failed: 1
Apr 11 08:54:34 SEDECORE kernel: sas: ata9: end_device-7:2: cmd error handler
Apr 11 08:54:34 SEDECORE kernel: sas: ata7: end_device-7:0: dev error handler
Apr 11 08:54:34 SEDECORE kernel: sas: ata8: end_device-7:1: dev error handler
Apr 11 08:54:34 SEDECORE kernel: sas: ata9: end_device-7:2: dev error handler
Apr 11 08:54:34 SEDECORE kernel: sas: ata10: end_device-7:3: dev error handler
Apr 11 08:54:34 SEDECORE kernel: sas: --- Exit sas_scsi_recover_host: busy: 0 failed: 1 tries: 1
I am not a network expert, but something doesn't seem right with your network.
UD won't turn on the 'Mount' button if the remote server won't respond to a ping. Go to a command line and manually ping the server in question. If you don't get a response, you'll have to figure out why not.