diff --git a/nixos-module/default.nix b/nixos-module/default.nix
index f2ca517..11652a9 100644
--- a/nixos-module/default.nix
+++ b/nixos-module/default.nix
@@ -641,6 +641,17 @@ in {
       user = cfg.user;
       group = cfg.group;
       phpPackage = phpPackage;
+      # PHP's own stock defaults (upload_max_filesize=2M, post_max_size=8M)
+      # are far below what both proxy configs below already allow through
+      # (nginx's client_max_body_size / caddy's request_body.max_size, both
+      # 64M) -- without this, PHP itself truncates/rejects any plant photo
+      # upload past 2M (a single modern phone camera JPEG, easily) before
+      # PlantsModel::editPlantPhoto ever sees it, surfacing as a bare
+      # "Errorneous file" 500 with no indication it was ever a size limit.
+      phpOptions = ''
+        upload_max_filesize = 64M
+        post_max_size = 64M
+      '';
       settings = {
         "listen.owner" = if cfg.proxy.server == "caddy" then config.services.caddy.user else config.services.nginx.user;
         "listen.group" = if cfg.proxy.server == "caddy" then config.services.caddy.group else config.services.nginx.group;