diff --git a/Backend/Controllers/SpeakerController.cs b/Backend/Controllers/SpeakerController.cs
index 5b99f812a3..54a0f57e8d 100644
--- a/Backend/Controllers/SpeakerController.cs
+++ b/Backend/Controllers/SpeakerController.cs
@@ -116,6 +116,13 @@ public async Task<IActionResult> DeleteSpeaker(string projectId, string speakerI
                 return NotFound(speakerId);
             }
 
+            // Delete consent file
+            var path = FileStorage.GetConsentFilePath(speakerId);
+            if (path is not null)
+            {
+                IO.File.Delete(path);
+            }
+
             // Delete speaker and return success
             return Ok(await _speakerRepo.Delete(projectId, speakerId));
         }
@@ -145,8 +152,8 @@ public async Task<IActionResult> RemoveConsent(string projectId, string speakerI
             {
                 return StatusCode(StatusCodes.Status304NotModified, speakerId);
             }
-            var path = FileStorage.GenerateConsentFilePath(speaker.Id);
-            if (IO.File.Exists(path))
+            var path = FileStorage.GetConsentFilePath(speaker.Id);
+            if (path is not null)
             {
                 IO.File.Delete(path);
             }
@@ -232,9 +239,12 @@ public async Task<IActionResult> UploadConsent(
             {
                 return BadRequest("Empty File");
             }
+
+            var extension = IO.Path.GetExtension(file.FileName) ?? "";
             if (file.ContentType.Contains("audio"))
             {
                 speaker.Consent = ConsentType.Audio;
+                extension = ".webm";
             }
             else if (file.ContentType.Contains("image"))
             {
@@ -245,8 +255,15 @@ public async Task<IActionResult> UploadConsent(
                 return BadRequest("File should be audio or image");
             }
 
+            // Delete old consent file
+            var old = FileStorage.GetConsentFilePath(speaker.Id);
+            if (old is not null)
+            {
+                IO.File.Delete(old);
+            }
+
             // Copy file data to a new local file
-            var path = FileStorage.GenerateConsentFilePath(speakerId);
+            var path = FileStorage.GenerateConsentFilePath(speakerId, extension);
             await using (var fs = new IO.FileStream(path, IO.FileMode.OpenOrCreate))
             {
                 await file.CopyToAsync(fs);
@@ -284,8 +301,8 @@ public IActionResult DownloadConsent(string speakerId)
             }
 
             // Ensure file exists
-            var path = FileStorage.GenerateConsentFilePath(speakerId);
-            if (!IO.File.Exists(path))
+            var path = FileStorage.GetConsentFilePath(speakerId);
+            if (path is null)
             {
                 return NotFound(speakerId);
             }
diff --git a/Backend/Helper/FileStorage.cs b/Backend/Helper/FileStorage.cs
index 60b02ffa4b..124c658978 100644
--- a/Backend/Helper/FileStorage.cs
+++ b/Backend/Helper/FileStorage.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Linq;
 using System.Runtime.Serialization;
 
 namespace BackendFramework.Helper
@@ -96,9 +97,20 @@ public static string GenerateAvatarFilePath(string userId)
         /// Generate the path to where Consent audio/images are stored.
         /// </summary>
         /// <exception cref="InvalidIdException"> Throws when id invalid. </exception>
-        public static string GenerateConsentFilePath(string speakerId)
+        public static string GenerateConsentFilePath(string speakerId, string? extension = null)
         {
-            return GenerateFilePath(ConsentDir, Sanitization.SanitizeId(speakerId));
+            var fileName = Path.ChangeExtension(Sanitization.SanitizeId(speakerId), extension);
+            return GenerateFilePath(ConsentDir, fileName);
+        }
+
+        /// <summary>
+        /// Get the path of a Consent audio/images, or null if it doesn't exist.
+        /// </summary>
+        /// <exception cref="InvalidIdException"> Throws when id invalid. </exception>
+        public static string? GetConsentFilePath(string speakerId)
+        {
+            var searchPattern = $"*{Sanitization.SanitizeId(speakerId)}*";
+            return Directory.GetFiles(GenerateDirPath(ConsentDir, true), searchPattern).FirstOrDefault();
         }
 
         /// <summary>
diff --git a/Backend/Services/LiftService.cs b/Backend/Services/LiftService.cs
index 9acb4a412d..d9f082b2d0 100644
--- a/Backend/Services/LiftService.cs
+++ b/Backend/Services/LiftService.cs
@@ -347,12 +347,19 @@ public async Task<string> LiftExport(
             {
                 if (speaker.Consent != ConsentType.None)
                 {
-                    var src = FileStorage.GenerateConsentFilePath(speaker.Id);
-                    if (File.Exists(src))
+                    var src = FileStorage.GetConsentFilePath(speaker.Id);
+                    if (src is not null)
                     {
-                        var dest = Path.Combine(consentDir, speaker.Id);
-                        File.Copy(src, dest, true);
-
+                        var dest = Path.Combine(consentDir, Path.GetFileName(src));
+                        if (Path.GetExtension(dest).Equals(".webm", StringComparison.OrdinalIgnoreCase))
+                        {
+                            dest = Path.ChangeExtension(dest, ".wav");
+                            await FFmpeg.Conversions.New().Start($"-y -i \"{src}\" \"{dest}\"");
+                        }
+                        else
+                        {
+                            File.Copy(src, dest);
+                        }
                     }
                 }
             }