Could you not use the free download of Mp3Tag (https://www.mp3tag.de/en/) to change the pictures and genres in the music folders? Then rescan the library using Minimserver to update the files. After that I assume you should only need to resynch your music library in the JPLAY iOS App to see the new pictures and genres.
Control Point: Apple iPad (9th gen), 64Gb storage, 3Gb RAM, JPLAY for iOS 1.2.7; Samsung Galaxy Tab S6 Lite, 128Gb storage, 4Gb RAM, Bubble UPnP 4.4.8; Dell Inspiron 15 5510 laptop (Windows 11 Professional (x64) Version 23H2 (build 22631.4169), Intel Core i7-11390H, 2.93 GHz, 512Gb KIOXIA M2 PCIe NVMe (RAID) SSD, 16Gb DDR4 3200 MHz RAM), Upplay 1.8.1.
Control and Audio-PCs: Asus Mini PC PN60, Intel Core i5 8250U 1.6 GHz, 250Gb Kingston A2000 M2 NVMe SSD and 8Gb DDR4 2400 MHz RAM.
OS: Windows Server 2019 (Standard Edition) in highly optimized Desktop mode, command prompt shell for initial setup after which Control and Audio-PCs run headless (monitor, keyboard, mouse all disconnected).
Optimization: Audiophile Optimizer 3.0, TrustedClean 3.1b-server on RAM Disk (Control-PC and Audio-PC - automated RAM Disk creation procedure and TC settings as in my RAM Disk Guide, revised 16 January 2025), Process Lasso Server Edition 15.1.0.50, additional Windows processes/services stopped via registry editor, task manager and modified CAD DSK script (for complete procedure see my WS2019 Optimization Guide, revised 16 January 2025).
Renderer: JPLAY FEMTO 7.0D UPnP (Alternative version), Server: JPLAY FEMTO 7.0D femtoServer, File Manager: Q-Dir 12.13, Library Manager: JRiver MC 32.0.6.
JPLAY Settings: Playing via: KS, Engine: ULTRAstream, Bitstream: Native, Bitperfect Volume: OFF, DAC Link: 1000, XtreamSize: 1000, Throttle: ON, Hibernate Mode: ON.
Equipment Configuration: Tablet/Laptop > WiFi > Control-PC > 1m SUPRA Cat 8 Ethernet Cable > Audio-PC > 3m Chord C-USB Cable > Topping D90SE > 1m Chord Chameleon Plus XLR cables with Neutrik connectors > Rotel RC 1590 > 2m Mogami NEGLEX XLR cables with Neutrik connectors > March Audio P501 Monoblocks with Purifi 1ET7040SA modules > Van Den Hul CS-122 Hybrid speaker cables (Neotech banana/spade connectors) > Bryston PX-1 external crossovers > speaker cables (as before) > Bryston Model T Signature Speakers. AC power filtered/cleaned via Thor A12BF Smart Power Board.
Music Storage: Main Library: 6Tb Seagate HDD/Hub+6Tb Seagate HDD (all connections via 0.5m Avencore Premium USB 3.0 cables); Backups (x2): as per Main Library.