diff --git a/src/index.ts b/src/index.ts
index c42162a1..0c367629 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -99,8 +99,8 @@ export default class ImageTool implements BlockTool {
       endpoints: config.endpoints,
       additionalRequestData: config.additionalRequestData,
       additionalRequestHeaders: config.additionalRequestHeaders,
-      field: config.field || 'image',
-      types: config.types || 'image/*',
+      field: config.field,
+      types: config.types,
       captionPlaceholder: this.api.i18n.t(config.captionPlaceholder ? config.captionPlaceholder: 'Caption'),
       buttonContent: config.buttonContent,
       uploader: config.uploader,
diff --git a/src/types/types.ts b/src/types/types.ts
index 53945d7c..f4b564f6 100644
--- a/src/types/types.ts
+++ b/src/types/types.ts
@@ -117,12 +117,12 @@ export interface ImageConfig {
   /**
    * Field name for the uploaded image.
    */
-  field: string;
+  field?: string;
 
   /**
    * Allowed mime-types for the uploaded image.
    */
-  types: string;
+  types?: string;
 
   /**
    * Placeholder text for the caption field.
diff --git a/src/uploader.ts b/src/uploader.ts
index 006b4690..d7348078 100644
--- a/src/uploader.ts
+++ b/src/uploader.ts
@@ -72,7 +72,7 @@ export default class Uploader {
     // custom uploading
     if (this.config.uploader && typeof this.config.uploader.uploadByFile === 'function') {
       const uploadByFile = this.config.uploader.uploadByFile;
-      upload = ajax.selectFiles({ accept: this.config.types}).then((files: File[]) => {
+      upload = ajax.selectFiles({ accept: this.config.types || 'image/*'}).then((files: File[]) => {
         preparePreview(files[0]);
 
         const customUpload = uploadByFile(files[0]);
@@ -89,12 +89,12 @@ export default class Uploader {
       upload = ajax.transport({
         url: this.config.endpoints.byFile,
         data: this.config.additionalRequestData,
-        accept: this.config.types,
+        accept: this.config.types || 'image/*',
         headers: new Headers(this.config.additionalRequestHeaders as Record<string, string>),
         beforeSend: (files: File[]) => {
           preparePreview(files[0]);
         },
-        fieldName: this.config.field,
+        fieldName: this.config.field || 'image',
       }).then((response: any) => response.body);
     }
 
@@ -181,7 +181,7 @@ export default class Uploader {
        */
       const formData = new FormData();
 
-      formData.append(this.config.field, file);
+      formData.append(this.config.field || 'image', file);
 
       if (this.config.additionalRequestData && Object.keys(this.config.additionalRequestData).length) {
         Object.entries(this.config.additionalRequestData).forEach(([name, value]: [string, any]) => {