fix if container not created

main.js

@@ -509,10 +509,7 @@
         }
         else if (variant == "h") {
           let filesContainer = document.querySelector(`[data-container="${fileInputs[inputName].h}"]`)
-          fileListContainer = filesContainer.querySelector(`.file-list-container`)
-          if (fileListContainer == null) {
-            filesContainer.append(makeFileListContainer())
-          }
+          fileListContainer = getFileListContainer(filesContainer)
         }
       }
     }
@@ -624,6 +621,16 @@
       classes: "file-list-container"
     })
   }
+  
+  function getFileListContainer(filesContainer) {
+    let fileListContainer = filesContainer.querySelector(".file-list-container")
+    if (fileListContainer == null) {
+      fileListContainer = makeFileListContainer()
+      filesContainer.append(fileListContainer)
+    }
+
+    return fileListContainer
+  }
 
   function makeHandleFilesFunc() {
     let storedFiles = []
@@ -647,11 +654,7 @@
 
         if (variant) {
           let [_, filesContainer] = getContainersByVariant(variant, getAttachmentIndex(this))
-          fileListContainer = filesContainer.querySelector(".file-list-container")
-          if (fileListContainer == null) {
-            fileListContainer = makeFileListContainer()
-            filesContainer.append(fileListContainer)
-          }
+          fileListContainer = getFileListContainer(filesContainer)
         }
         else {
           fileListContainer = this.parentElement.parentElement.querySelector(".file-list-container")
@@ -828,7 +831,7 @@
       let [from, to] = getContainersByVariant(this.value, attachmentIndex)
       let newFiles = [...from.querySelectorAll(`.file-container-new`)]
       for (const newFile of newFiles) {
-        to.querySelector(`.file-list-container`).append(newFile)
+        getFileListContainer(to).append(newFile)
       }
     }))
   }