diff --git a/web/src/lib/util/file_util.ts b/web/src/lib/util/file_util.ts
index 5b267350..a7e564ad 100644
--- a/web/src/lib/util/file_util.ts
+++ b/web/src/lib/util/file_util.ts
@@ -7,7 +7,7 @@ export function getFileURL(record: { [key: string]: any; }, filename?: string, t
         return filename;
     }
 
-    return `/api/v1/files/${record.collectionId}/${record.id}/${filename}${thumb ? '?thumb='+thumb : ''}`
+    return `/api/v1/files/${record.collectionId}/${record.id}/${filename}${thumb ? '?thumb=' + thumb : ''}`
 }
 
 export function isURL(value: string) {
@@ -50,16 +50,55 @@ export function saveAs(data: Blob, fileName: string) {
     window.URL.revokeObjectURL(url);
 };
 
-function buildFormData(formData: FormData, data: any, parentKey?: string, exclude?: string[]) {
-    if (data && typeof data === 'object' && !(data instanceof Date) && !(data instanceof File) && !(data instanceof Blob)) {
-        Object.keys(data).forEach(key => {
-            if (exclude?.includes(key)) {
+function buildFormData(
+    formData: FormData,
+    data: any,
+    parentKey?: string,
+    exclude: string[] = []
+) {
+    if (data === null || data === undefined) {
+        return;
+    }
+
+    // Handle arrays
+    if (Array.isArray(data)) {
+        if (data.length === 0) {
+            // Add an explicit empty entry for empty arrays
+            formData.append(parentKey!, '');
+            return;
+        }
+
+        data.forEach((value, index) => {
+            const key = parentKey ? `${parentKey}` : String(index);
+            buildFormData(formData, value, key, exclude);
+        });
+    }
+
+    // Handle objects (but not Date, File, Blob)
+    else if (
+        typeof data === 'object' &&
+        !(data instanceof Date) &&
+        !(data instanceof File) &&
+        !(data instanceof Blob)
+    ) {
+        Object.keys(data).forEach((key) => {
+            if (exclude.includes(key)) {
                 return;
             }
-            buildFormData(formData, data[key], parentKey ? `${parentKey}` : key);
+            const value = data[key];
+            const newKey = parentKey ? `${parentKey}.${key}` : key;
+            buildFormData(formData, value, newKey, exclude);
         });
-    } else {
-        const value = data == null ? '' : data;
+    }
+
+    // Handle primitives and special types
+    else {
+        const value =
+            data instanceof Date
+                ? data.toISOString()
+                : data == null
+                    ? ''
+                    : data;
 
         formData.append(parentKey!, value);
     }