diff --git a/packages/surveys/src/components/general/file-input.test.tsx b/packages/surveys/src/components/general/file-input.test.tsx
index bd78fd7476..51a3449a8d 100644
--- a/packages/surveys/src/components/general/file-input.test.tsx
+++ b/packages/surveys/src/components/general/file-input.test.tsx
@@ -44,7 +44,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={1}
         allowMultipleFiles={true}
       />
@@ -55,7 +55,7 @@ describe("FileInput", () => {
 
     await waitFor(() => {
       expect(onFileUpload).toHaveBeenCalledWith(expect.objectContaining({ name: "test.txt" }), {
-        allowedFileExtensions: ["plain"],
+        allowedFileExtensions: ["txt"],
         surveyId: "survey1",
       });
       expect(onUploadCallback).toHaveBeenCalledWith(["uploaded-url"]);
@@ -108,7 +108,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={initialUrls}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
@@ -128,7 +128,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={["dup.txt"]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
@@ -151,7 +151,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={1}
         allowMultipleFiles={true}
       />
@@ -185,7 +185,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={1}
         allowMultipleFiles={true}
       />
@@ -242,7 +242,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={["dup.txt"]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
@@ -274,7 +274,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={0.5} // 500KB limit
         allowMultipleFiles={true}
       />
@@ -311,7 +311,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={0.1} // Very small limit to ensure filtering
         allowMultipleFiles={true}
       />
@@ -339,7 +339,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={initialUrls}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
@@ -359,7 +359,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
@@ -402,7 +402,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         maxSizeInMB={1}
         allowMultipleFiles={true}
       />
@@ -426,7 +426,7 @@ describe("FileInput", () => {
         onFileUpload={onFileUpload}
         onUploadCallback={onUploadCallback}
         fileUrls={[]}
-        allowedFileExtensions={["plain"]}
+        allowedFileExtensions={["txt"]}
         allowMultipleFiles={true}
       />
     );
diff --git a/packages/surveys/src/components/general/file-input.tsx b/packages/surveys/src/components/general/file-input.tsx
index 6bc0cf3f18..5e1a2cfc1f 100644
--- a/packages/surveys/src/components/general/file-input.tsx
+++ b/packages/surveys/src/components/general/file-input.tsx
@@ -4,7 +4,7 @@ import { getMimeType, isFulfilled, isRejected } from "@/lib/utils";
 import { useAutoAnimate } from "@formkit/auto-animate/react";
 import { useCallback, useEffect, useMemo, useState } from "preact/hooks";
 import { type JSXInternal } from "preact/src/jsx";
-import { type TAllowedFileExtension } from "@formbricks/types/common";
+import { type TAllowedFileExtension, ZAllowedFileExtension } from "@formbricks/types/common";
 import { type TJsFileUploadParams } from "@formbricks/types/js";
 import { type TUploadFileConfig } from "@formbricks/types/storage";
 
@@ -182,11 +182,14 @@ export function FileInput({
 
     // filter out files that are not allowed
     const validFiles = fileArray.filter((file) => {
-      const fileExtension = file.type.substring(file.type.lastIndexOf("/") + 1) as TAllowedFileExtension;
+      const fileExtension = file.name.split(".").pop()?.toLowerCase() as TAllowedFileExtension;
+      if (!fileExtension || fileExtension === file.name.toLowerCase()) return false;
+
       if (allowedFileExtensions) {
         return allowedFileExtensions.includes(fileExtension);
       }
-      return true;
+
+      return Object.values(ZAllowedFileExtension.enum).includes(fileExtension);
     });
 
     if (!validFiles.length) {
diff --git a/packages/types/common.ts b/packages/types/common.ts
index baf44b9106..b212e8519f 100644
--- a/packages/types/common.ts
+++ b/packages/types/common.ts
@@ -25,13 +25,14 @@ export const ZAllowedFileExtension = z.enum([
   "jpg",
   "webp",
   "pdf",
+  "eml",
   "doc",
   "docx",
   "xls",
   "xlsx",
   "ppt",
   "pptx",
-  "plain",
+  "txt",
   "csv",
   "mp4",
   "mov",
@@ -51,13 +52,14 @@ export const mimeTypes: Record<TAllowedFileExtension, string> = {
   jpg: "image/jpeg",
   webp: "image/webp",
   pdf: "application/pdf",
+  eml: "message/rfc822",
   doc: "application/msword",
   docx: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
   xls: "application/vnd.ms-excel",
   xlsx: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
   ppt: "application/vnd.ms-powerpoint",
   pptx: "application/vnd.openxmlformats-officedocument.presentationml.presentation",
-  plain: "text/plain",
+  txt: "text/plain",
   csv: "text/csv",
   mp4: "video/mp4",
   mov: "video/quicktime",