Ported from my Modrinth modpack: https://modrinth.com/modpack/recording-client-for-vanilla-mc-servers/version/1.21-1.2.0

Changelog (Copied from Modrinth):

The 1.21 Recording Features Update!

Backporting modpack version 1.21.4-1.1.0 to MC 1.21 and adding new features.

Changelog (Quick Summary):

• Added new mods to bring in new features for a better recording experience for content creators! e.g.
  • Take 4k screenshots on a 1080p monitor! (configurable)
  • Pose Armor Stands easily!
  • Connected textures for glass, grass, and more!
  • "Rule of thirds" overlays for composing your shots (toggleable)
  • Isometric Renders of blocks, mobs, items, etc. Useful for making thumbnails!
  • Shields no longer take up half the screen! (toggleable)
  • Crosshair automatically hides whenever it's useless anyways. (No more ruined screenshots due to pointless crosshairs being in the way!) (configurable)
  • Status (Enables you to set a status, so you can tell other server members when you're available, recording, etc.)
• Updated mods from the previous 1.21 pack release.

Changelog (Details):

v1.21-1.2.0 Changelog:

Added Mods:

Modpack v1.1.0 Added Mods: (Added new mods from the latest MC 1.21.4 modpack (v1.21.4-1.1.0), or found compatible replacements with similar functionality):

• Added Armor Poser (easy configuration of Armor Stands (shift-click)) (requires being installed server-side to use). More info: https://modrinth.com/mod/armor-poser
• Added Chunky (useful along with Bobby mod. Can pre-generate chunks in the "bobby-fallback" single-player world to get those extreme render distances). Instructions here: https://modrinth.com/plugin/chunky Let me know if you'd like a tutorial video on how to get extreme render distances with this. (Note for server admins: I tested, and non-OP players can only use this command in single-player. So this can't be used to crash servers or anything).
• Added Continuity (connected glass textures and more)
• Added Creator Overlays (adds gridlines "rule of thirds" overlays for making vertical/horizontal videos, etc., for easier composition of your shots (especially useful with Replay Mod). More info: https://modrinth.com/mod/creatoroverlays
• Added Fabrishot (Can take high-resolution 4k screenshots (configurable) even on a lower-resolution monitor! Meaning you can zoom in in post-production without losing quality! More info: https://modrinth.com/mod/fabrishot
• Added Fast Better Grass resource pack (optional, connected grass texture)
• Added Isometric Renders (customizable image renders with transparent background (parts of world, items, entities, etc.). Use command /isorender to open GUI. Useful for making thumbnails.) More info: https://modrinth.com/mod/isometric-renders
• Added "owo-lib" (support mod for Isometric Renders)
• Added "Small Shield & Totem" resource pack (so the shield doesn't take up half the screen) (enable/disable in the "resource packs" menu).

Modpack v1.2.0 Added Mods:

• Added Dynamic Crosshair (Ever tried to make a thumbnail using a screenshot from a video you've already recorded, only to find the crosshair is in the way & messes up the shot? This mod helps fix that by hiding the crosshair whenever it's useless anyways. (And showing it when it's needed for gameplay). Configurable in "Mods" menu.) https://modrinth.com/mod/dynamiccrosshair
• Added Dynamic Crosshair Compat (compatibility mod) https://modrinth.com/mod/dynamiccrosshaircompat
• Added Status (Enables you to set a status, so you can tell other server members when you're available, recording, etc.) (requires being installed server-side to do anything) https://modrinth.com/mod/status

Removed Mods:

• Removed Indium (no longer required since Sodium 0.6.0)

Config Changes:

• Set Dynamic Crosshair to use Vanilla crosshair style. (Configurable in "Mods" menu).

Updated Mods:

Updated mods from the previous MC 1.21 modpack release:

• Updated Fabric Loader (0.16.5 to 0.16.10)
• Updated Architectury API (13.0.6 to 13.0.8)
• Updated Chat Heads (0.13.0 to 0.13.13)
• Updated CIT Resewn (1.2.0+1.21 to 1.2.2+1.21)
• Updated Cubes Without Borders (2.1.1+1.21 to 3.0.0+1.21)
• Updated ImmediatelyFast (1.2.21+1.21.1 to 1.6.1+1.21.1)
• Updated Iris Shaders (1.7.3+1.21 to 1.8.8+1.21.1)
• Updated Litematica (0.19.50 to 0.19.57)
• Updated Lithium (0.13.0 to 0.13.1)
• Updated MaLiLib (0.21.0 to 0.21.7)
• Updated MidnightControls (1.9.7 to 1.10.0)
• Updated MiniHUD (0.32.50 to 0.32.57)
• Updated Mod Menu (11.0.2 to 11.0.3)
• Updated Motschen's Better Leaves resource pack (8.0 to 9.0)
• Updated No Chat Reports (2.8.0 to 2.9.1)
• Updated ObsidianUI (0.2.7 to 0.2.9)
• Updated Reese's Sodium Options (1.7.3 to 1.8.3)
• Updated ReplayMod (1.21-2.6.19 to 1.21-2.6.20)
• Updated Shulker Box Tooltip (5.1.1 to 5.1.2)
• Updated Simple Voice Chat (2.5.22 to 2.5.28)
• Updated Sodium (0.5.11 to 0.6.9)
• Updated Sodium Extra (0.5.7 to 0.6.0)
• Updated YetAnotherConfigLib (3.5.0 to 3.6.2)