As a senior assistant editor, I was responsible for producing marketing collaterals, which included writing the content, creating the concept, and designing the layout. These include digital flyers, catalogs, brochures, and video presentations, among others. 

Here are some samples of marketing collaterals: 

Sample 1: Digital flyer

Sample 2: Digital flyer

Here are other samples of digital marketing materials that I made.
Sample 3: Logo 

Sample 4: Digital invitation

Sample 5: Digital flyer