diff --git a/packages/builder/src/storage/providers/github-provider.ts b/packages/builder/src/storage/providers/github-provider.ts
index 9c51efd9..001a2f9b 100644
--- a/packages/builder/src/storage/providers/github-provider.ts
+++ b/packages/builder/src/storage/providers/github-provider.ts
@@ -242,7 +242,8 @@ export class GitHubStorageProvider implements StorageProvider {
       if (!obj.key) continue
 
       const dir = path.dirname(obj.key)
-      const basename = path.basename(obj.key, path.extname(obj.key))
+      // use path.parse to safely get the filename without extension (case-insensitive extension handling)
+      const basename = path.parse(obj.key).name
       const groupKey = `${dir}/${basename}`
 
       if (!fileGroups.has(groupKey)) {
diff --git a/packages/builder/src/storage/providers/local-provider.ts b/packages/builder/src/storage/providers/local-provider.ts
index 3d8cc1c6..5672ed47 100644
--- a/packages/builder/src/storage/providers/local-provider.ts
+++ b/packages/builder/src/storage/providers/local-provider.ts
@@ -236,7 +236,9 @@ export class LocalStorageProvider implements StorageProvider {
 
       // 如果是图片文件，查找对应的视频文件
       if (SUPPORTED_FORMATS.has(ext)) {
-        const baseName = path.basename(obj.key, ext)
+        // use path.parse to get the name without extension to avoid issues
+        // when the file extension has different casing (e.g. .HEIC)
+        const baseName = path.parse(obj.key).name
         const dirName = path.dirname(obj.key)
 
         // 查找对应的 .mov 文件
diff --git a/packages/builder/src/storage/providers/s3-provider.ts b/packages/builder/src/storage/providers/s3-provider.ts
index 1ebd0ae8..c99ee2dd 100644
--- a/packages/builder/src/storage/providers/s3-provider.ts
+++ b/packages/builder/src/storage/providers/s3-provider.ts
@@ -229,7 +229,7 @@ export class S3StorageProvider implements StorageProvider {
       if (!obj.key) continue
 
       const dir = path.dirname(obj.key)
-      const basename = path.basename(obj.key, path.extname(obj.key))
+      const basename = path.parse(obj.key).name
       const groupKey = `${dir}/${basename}`
 
       if (!fileGroups.has(groupKey)) {