diff --git a/app.py b/app.py
index 3fb0120..73d61e4 100644
--- a/app.py
+++ b/app.py
@@ -326,6 +326,8 @@ class Handler(BaseHTTPRequestHandler):
         if path == "/api/order":
             return game.post_order(world, player, body.get("kind"), str(item), qty, body.get("provide"),
                                    body.get("reward"), now)
+        if path == "/api/order/provide":
+            return game.provide_reagent(world, player, body.get("id"), str(item))
         if path == "/api/order/cancel":
             return game.cancel_order(world, player, body.get("id"), now)
         if path == "/api/order/work":
diff --git a/game.py b/game.py
index 5a2ddad..3b6d093 100644
--- a/game.py
+++ b/game.py
@@ -2125,6 +2125,22 @@ def post_order(world: dict, player: dict, kind: str, item: str, qty, provide, re
     return None
 
 
+def provide_reagent(world: dict, player: dict, order_id, item: str) -> str | None:
+    """Put a reagent into your own order after posting it, enough for what's still to be made."""
+    order = order_by_id(world, order_id)
+    if not order or order["by"] != player["id"] or order["status"] != "open" or order["kind"] != "craft":
+        return "No such order"
+    action = ACTION_BY_ID[order["action"]]
+    if item not in action["inputs"] or item in order["provided"]:
+        return "Already provided" if item in order["provided"] else "That isn't in the recipe"
+    need = action["inputs"][item] * _batches(action, order["item"], order["qty"] - order["delivered"])
+    if player["bank"].get(item, 0) < need:
+        return f"{ITEMS[item]['name']}: {player['bank'].get(item, 0)} / {need}"
+    bank_take(player, item, need)
+    order["provided"][item] = need
+    return None
+
+
 def _refund(world: dict, order: dict, now: float) -> None:
     owner = world["players"].get(order["by"])
     if not owner:
diff --git a/static/app.js b/static/app.js
index dabf582..b96874b 100644
--- a/static/app.js
+++ b/static/app.js
@@ -90,7 +90,7 @@ async function refresh() {
 
 function accept(state) {
   version ??= state.version;
-  if (state.version !== version && !document.querySelector("[data-keep]:focus") && $("#modal").hidden) {
+  if (state.version !== version && !document.querySelector("[data-keep]:focus") && $("#modal").hidden && !draft) {
     location.reload();  // a new build was deployed
     return;
   }
@@ -1197,8 +1197,12 @@ function orderSlots(o) {
         <span class="swap-qty">${fmt(per * all)}</span><span class="tick">✓</span></span></div>`;
     }
     const need = per * (o.status === "open" ? left : all), have = S.me.bank[id] || 0;
-    return `<div class="ro-slot open" title="${esc(`${name}: crafter brings`)}"><span class="doll-slot empty-req">${item(id).icon}</span>
-      <span class="ro-have ${o.by === S.uid ? "muted" : have < need ? "bad" : "good"}">${o.by === S.uid ? `×${fmt(need)}` : `${fmt(have)} / ${fmt(need)}`}</span></div>`;
+    // On your own open order, an empty slot can still be filled from your bank.
+    const fill = o.by === S.uid && o.status === "open";
+    return `<div class="ro-slot open">${fill
+        ? `<button class="doll-slot empty-req" data-order-fill="${o.id}" data-item="${id}" ${have < need ? "disabled" : ""} title="${esc(`${name}: ${fmt(have)} / ${fmt(need)}`)}">${item(id).icon}</button>`
+        : `<span class="doll-slot empty-req" title="${esc(`${name}: crafter brings`)}">${item(id).icon}</span>`}
+      <span class="ro-have ${o.status !== "open" ? "muted" : have < need ? "bad" : "good"}">${o.status !== "open" ? `×${fmt(need)}` : `${fmt(have)} / ${fmt(need)}`}</span></div>`;
   }).join("");
 }
 
@@ -1614,6 +1618,7 @@ document.addEventListener("click", (e) => {
   if (d.orderDrop) return act("/api/order/drop", { id: Number(d.orderDrop) });
   if (d.orderDeliver) return act("/api/order/deliver", { id: Number(d.orderDeliver) });
   if (d.orderCancel) return act("/api/order/cancel", { id: Number(d.orderCancel) });
+  if (d.orderFill) return act("/api/order/provide", { id: Number(d.orderFill), item: d.item });
   if (d.doll) {
     dollPick = dollPick === d.doll ? null : d.doll;
     return render();
diff --git a/tests/test_game.py b/tests/test_game.py
index 367d8d9..5dd9d0a 100644
--- a/tests/test_game.py
+++ b/tests/test_game.py
@@ -1580,3 +1580,16 @@ class WorkOrderTest(unittest.TestCase):
         game.expire_orders(self.world, T0 + 4 * game.DAY)
         self.assertEqual(self.mike["gold"], 200)
         self.assertEqual(self.mike["bank"]["iron_bar"], 3)
+
+    def test_requester_can_fill_a_slot_after_posting(self):
+        self.mike["gold"] = 200
+        self.mike["bank"] = {"iron_bar": 3, "clay_core": 3}
+        game.post_order(self.world, self.mike, "craft", "iron_warhammer", 1, [], 140, T0)
+        order = self.world["orders"][0]
+        self.assertIsNone(game.provide_reagent(self.world, self.mike, order["id"], "iron_bar"))
+        self.assertEqual(order["provided"], {"iron_bar": 3})
+        self.fred["bank"] = {"oak_plank": 1, "clay_core": 3}
+        self.assertIsNone(game.work_order(self.world, self.fred, order["id"], T0))
+        game.process_player(self.world, self.fred, T0 + 600, random.Random(1))
+        self.assertEqual(self.mike["bank"].get("iron_warhammer"), 1)
+        self.assertEqual(self.fred["bank"], {})  # used his own plank and cores, never needed bars