diff --git a/src/components/action-menu/action-menu.jsx b/src/components/action-menu/action-menu.jsx
index 36cf5d4449f7ddd1815cb5388d3784915a709a3e..f9e50f3ff667e02ff78cc5d345e761993e9b8709 100644
--- a/src/components/action-menu/action-menu.jsx
+++ b/src/components/action-menu/action-menu.jsx
@@ -142,7 +142,7 @@ class ActionMenu extends React.Component {
                 <div className={styles.moreButtonsOuter}>
                     <div className={styles.moreButtons}>
                         {(moreButtons || []).map(({img, title, onClick: handleClick,
-                            fileAccept, fileChange, fileInput}, keyId) => {
+                            fileAccept, fileChange, fileInput, fileMultiple}, keyId) => {
                             const isComingSoon = !handleClick;
                             const hasFileInput = fileInput;
                             const tooltipId = `${this.mainTooltipId}-${title}`;
@@ -166,6 +166,7 @@ class ActionMenu extends React.Component {
                                             <input
                                                 accept={fileAccept}
                                                 className={styles.fileInput}
+                                                multiple={fileMultiple}
                                                 ref={fileInput}
                                                 type="file"
                                                 onChange={fileChange}
@@ -198,7 +199,8 @@ ActionMenu.propTypes = {
         onClick: PropTypes.func, // Optional, "coming soon" if no callback provided
         fileAccept: PropTypes.string, // Optional, only for file upload
         fileChange: PropTypes.func, // Optional, only for file upload
-        fileInput: PropTypes.func // Optional, only for file upload
+        fileInput: PropTypes.func, // Optional, only for file upload
+        fileMultiple: PropTypes.bool // Optional, only for file upload
     })),
     onClick: PropTypes.func.isRequired,
     title: PropTypes.node.isRequired,
diff --git a/src/components/sprite-selector/sprite-selector.jsx b/src/components/sprite-selector/sprite-selector.jsx
index 115eaee955f25d6ccba82b86c7f8206cc0ee3719..d834f43b03bd44a23ce4fe6326543670439dbe27 100644
--- a/src/components/sprite-selector/sprite-selector.jsx
+++ b/src/components/sprite-selector/sprite-selector.jsx
@@ -122,7 +122,8 @@ const SpriteSelectorComponent = function (props) {
                         onClick: onFileUploadClick,
                         fileAccept: '.svg, .png, .jpg, .jpeg, .sprite2, .sprite3',
                         fileChange: onSpriteUpload,
-                        fileInput: spriteFileInput
+                        fileInput: spriteFileInput,
+                        fileMultiple: true
                     }, {
                         title: intl.formatMessage(messages.addSpriteFromSurprise),
                         img: surpriseIcon,
diff --git a/src/components/stage-selector/stage-selector.jsx b/src/components/stage-selector/stage-selector.jsx
index 64a1948a82670324221c5743f0657e9215d89677..db89a67c5a961a5419d7bf5cb850bd75ae504813 100644
--- a/src/components/stage-selector/stage-selector.jsx
+++ b/src/components/stage-selector/stage-selector.jsx
@@ -104,7 +104,8 @@ const StageSelector = props => {
                         onClick: onBackdropFileUploadClick,
                         fileAccept: '.svg, .png, .jpg, .jpeg', // Bitmap coming soon
                         fileChange: onBackdropFileUpload,
-                        fileInput: fileInputRef
+                        fileInput: fileInputRef,
+                        fileMultiple: true
                     }, {
                         title: intl.formatMessage(messages.addBackdropFromSurprise),
                         img: surpriseIcon,
diff --git a/src/containers/costume-tab.jsx b/src/containers/costume-tab.jsx
index 83b27d4c3252cccd83c1f1567d73d486c4790b5d..a5b97d9cb4306e4d2cf3ada0e21e3bac30f125af 100644
--- a/src/containers/costume-tab.jsx
+++ b/src/containers/costume-tab.jsx
@@ -292,7 +292,8 @@ class CostumeTab extends React.Component {
                         onClick: this.handleFileUploadClick,
                         fileAccept: '.svg, .png, .jpg, .jpeg',
                         fileChange: this.handleCostumeUpload,
-                        fileInput: this.setFileInput
+                        fileInput: this.setFileInput,
+                        fileMultiple: true
                     },
                     {
                         title: intl.formatMessage(messages.addSurpriseCostumeMsg),
diff --git a/src/containers/sound-tab.jsx b/src/containers/sound-tab.jsx
index 40e08dfb737321de558b278c011c4a2e9e980142..f417d238f33238400829064bb87b0dab57acc22c 100644
--- a/src/containers/sound-tab.jsx
+++ b/src/containers/sound-tab.jsx
@@ -223,7 +223,8 @@ class SoundTab extends React.Component {
                     onClick: this.handleFileUploadClick,
                     fileAccept: '.wav, .mp3',
                     fileChange: this.handleSoundUpload,
-                    fileInput: this.setFileInput
+                    fileInput: this.setFileInput,
+                    fileMultiple: true
                 }, {
                     title: intl.formatMessage(messages.surpriseSound),
                     img: surpriseIcon,
diff --git a/src/lib/file-uploader.js b/src/lib/file-uploader.js
index 74f3c64a8625c05610c4e0d505484e56fc4a8600..dec463d6d81a1ca887349010843472bb8e3b2c99 100644
--- a/src/lib/file-uploader.js
+++ b/src/lib/file-uploader.js
@@ -21,21 +21,22 @@ const extractFileName = function (nameExt) {
  * @param {Function} onload The function that handles loading the file
  */
 const handleFileUpload = function (fileInput, onload) {
-    let thisFile = null;
-    const reader = new FileReader();
-    reader.onload = () => {
-        // Reset the file input value now that we have everything we need
-        // so that the user can upload the same sound multiple times if
-        // they choose
-        fileInput.value = null;
-        const fileType = thisFile.type;
-        const fileName = extractFileName(thisFile.name);
+    const readFile = file => {
+        const reader = new FileReader();
+        reader.onload = () => {
+            // Reset the file input value now that we have everything we need
+            // so that the user can upload the same sound multiple times if
+            // they choose
+            fileInput.value = null;
+            const fileType = file.type;
+            const fileName = extractFileName(file.name);
 
-        onload(reader.result, fileType, fileName);
+            onload(reader.result, fileType, fileName);
+        };
+        reader.readAsArrayBuffer(file);
     };
-    if (fileInput.files) {
-        thisFile = fileInput.files[0];
-        reader.readAsArrayBuffer(thisFile);
+    for (let i = 0; i < fileInput.files.length; i++) {
+        readFile(fileInput.files[i]);
     }
 };