diff --git a/src-tauri/src/commands.rs b/src-tauri/src/commands.rs
index cbad6ae..05317c0 100644
--- a/src-tauri/src/commands.rs
+++ b/src-tauri/src/commands.rs
@@ -2239,7 +2239,12 @@ pub async fn export_assets(
         }
         "csv" => {
             let mut s = String::new();
-            s.push_str("id,row_id,asset_type,asset_name,video_name,side,in_scope,deleted,modified,lat,lng,start_lat,start_lng,end_lat,end_lng,link_pair_id,link_locked,image_path,image_path1,image_path2,image_path3\n");
+            // Bbox columns are appended after the existing schema so older
+            // spreadsheets that anchor on the first 21 columns keep working.
+            // Each row populates only the slots its asset_type uses (fixed
+            // assets fill the unprefixed `bbox_*`, range assets fill
+            // `start_/mid_/end_bbox_*`); unused slots stay empty.
+            s.push_str("id,row_id,asset_type,asset_name,video_name,side,in_scope,deleted,modified,lat,lng,start_lat,start_lng,end_lat,end_lng,link_pair_id,link_locked,image_path,image_path1,image_path2,image_path3,bbox_x1,bbox_y1,bbox_x2,bbox_y2,start_bbox_x1,start_bbox_y1,start_bbox_x2,start_bbox_y2,mid_bbox_x1,mid_bbox_y1,mid_bbox_x2,mid_bbox_y2,end_bbox_x1,end_bbox_y1,end_bbox_x2,end_bbox_y2\n");
             let csv_q = |v: Option<&str>| -> String {
                 let s = v.unwrap_or("");
                 if s.contains(',') || s.contains('"') || s.contains('\n') {
@@ -2250,9 +2255,20 @@ pub async fn export_assets(
             };
             let f = |o: Option<f64>| o.map(|v| v.to_string()).unwrap_or_default();
             let i = |o: Option<i64>| o.map(|v| v.to_string()).unwrap_or_default();
+            let bb = |o: Option<&(f64, f64, f64, f64)>| -> String {
+                match o {
+                    Some((x1, y1, x2, y2)) => format!("{},{},{},{}", x1, y1, x2, y2),
+                    None => ",,,".to_string(),
+                }
+            };
             for a in &assets {
+                let slots = bbox_by_asset_all.get(&a.id);
+                let bb_fixed = slots.and_then(|m| m.get("fixed"));
+                let bb_start = slots.and_then(|m| m.get("start"));
+                let bb_mid = slots.and_then(|m| m.get("mid"));
+                let bb_end = slots.and_then(|m| m.get("end"));
                 s.push_str(&format!(
-                    "{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n",
+                    "{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n",
                     a.id,
                     csv_q(Some(&a.row_id)),
                     a.asset_type,
@@ -2274,6 +2290,10 @@ pub async fn export_assets(
                     csv_q(a.image_path1.as_deref()),
                     csv_q(a.image_path2.as_deref()),
                     csv_q(a.image_path3.as_deref()),
+                    bb(bb_fixed),
+                    bb(bb_start),
+                    bb(bb_mid),
+                    bb(bb_end),
                 ));
             }
             s