bluetooth cannot transfer files to phone although connected

[Gordon Fitch]

Ubuntu version: 20.4

Not sure of package (bluez)? (Whatever handles Bluetooth)

What I expected: File is transferred.

What happened: transfer fails with mysterious error code (0x53) which sometimes shows up on phone and sometimes doesn't. In any case the transfer fails.

Additional notes: Error was observed before,
see https://bbs.archlinux.org/viewtopic.php?id=202815, however suggested solution on that page doesn't work for me so I assume there is some difference.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bluetooth (not installed)
ProcVersionSignature: Ubuntu 5.11.0-41.45~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Dec 16 18:50:38 2021
InstallationDate: Installed on 2021-01-27 (323 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: HP HP Pavilion Desktop TP01-0xxx
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-41-generic root=UUID=d2279364-889e-4dd0-9766-948e06f4ab3d ro quiet splash vt.handoff=7
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/07/2020
dmi.bios.release: 15.35
dmi.bios.vendor: AMI
dmi.bios.version: F.23
dmi.board.name: 8643
dmi.board.vendor: HP
dmi.board.version: SMVB
dmi.chassis.type: 3
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 52.41
dmi.modalias: dmi:bvnAMI:bvrF.23:bd07/07/2020:br15.35:efr52.41:svnHP:pnHPPavilionDesktopTP01-0xxx:pvr:sku3UQ92AA#ABA:rvnHP:rn8643:rvrSMVB:cvnHP:ct3:cvr:
dmi.product.family: 103C_53311M HP Pavilion Desktop PC
dmi.product.name: HP Pavilion Desktop TP01-0xxx
dmi.product.sku: 3UQ92AA#ABA
dmi.sys.vendor: HP
hciconfig:
 hci0: Type: Primary Bus: USB
  BD Address: 00:15:83:4E:03:27 ACL MTU: 384:8 SCO MTU: 64:8
  UP RUNNING PSCAN ISCAN INQUIRY
  RX bytes:5837051 acl:16480 sco:0 events:6085 errors:0
  TX bytes:44273 acl:1706 sco:0 commands:1272 errors:0