From a9f32a63f1a7cfc51e0977ba77869091d2060612 Mon Sep 17 00:00:00 2001
From: Tim van Uum <t_i_m92@hotmail.com>
Date: Thu, 2 Dec 2021 15:51:19 +0100
Subject: [PATCH 1/2] Update Conversion.php

Check for lower and uppercase image extensions but always return the originalExtension
---
 src/Conversions/Conversion.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Conversions/Conversion.php b/src/Conversions/Conversion.php
index ec2e1baa5..888cd1ff8 100644
--- a/src/Conversions/Conversion.php
+++ b/src/Conversions/Conversion.php
@@ -205,7 +205,7 @@ public function getResultExtension(string $originalFileExtension = ''): string
     {
         if ($this->shouldKeepOriginalImageFormat()) {
             if (in_array(strtolower($originalFileExtension), ['jpg', 'jpeg', 'pjpg', 'png', 'gif'])) {
-                return strtolower($originalFileExtension);
+                return $originalFileExtension;
             }
         }
 

From 366d2666b2023f5a0425fd74254c067f6516d3ba Mon Sep 17 00:00:00 2001
From: Tim van Uum <t_i_m92@hotmail.com>
Date: Thu, 2 Dec 2021 16:50:09 +0100
Subject: [PATCH 2/2] Change test to check if return extension is indeed
 uppercase as is the original extension.

---
 tests/Conversions/ConversionFileExtensionTest.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Conversions/ConversionFileExtensionTest.php b/tests/Conversions/ConversionFileExtensionTest.php
index e11c4e8cd..1e6da4aa9 100644
--- a/tests/Conversions/ConversionFileExtensionTest.php
+++ b/tests/Conversions/ConversionFileExtensionTest.php
@@ -27,7 +27,7 @@ public function it_can_keep_the_original_image_format_if_the_original_file_is_an
     {
         $media = $this->testModelWithConversion->addMedia($this->getUppercaseExtensionTestPng())->toMediaCollection();
 
-        $this->assertExtensionEquals('png', $media->getUrl('keep_original_format'));
+        $this->assertExtensionEquals('PNG', $media->getUrl('keep_original_format'));
     }
 
     /** @test */