MIME Type Administration 
In MIME type administration, you specify which MIME types can be uploaded during single and mass uploads.
Note
Unless you specify a type, it cannot be uploaded.
MIME type is the specification of the data format used in computer systems. MIME stands for Multipurpose Internet Mail Extensions. The MIME type consists of two parts: Specification of a media type, and the specification of a subtype. Both specifications are separated by a slash, for example, image/jpeg. This is determined from file coding.
You have created the properties in the classification system and have maintained the characteristics class for MIME type properties in Customizing.
In number range object maintenance (transaction SNRO), you have created an interval for the number range of the MIME type administration (object CRM_DAM_MT) if it does not exist yet.
When creating MIME types, pay attention to the following points:
When entering the MIME type, use <media type>/<subtype> syntax.
Media types describe file categories, for example, IMAGES, AUDIO, VIDEO.
If you require additional media types or descriptions in another language, maintain them in tables CRMC_DAM_MT_CAT and CRMC_DAM_MT_CATT. In the SAP Easy Access screen choose (transaction SE16).
You can also explicitly lock MIME types for upload.
For MIME types of the media type Image, specify whether the files can be converted.
In the Extension field, you can define one or more file endings for the MIME type, separated from each other by a semicolon (;).
You can assign the following to each MIME type:
Properties
These properties appear in qualification of a digital asset and are appended to the respective version of a digital asset. MIME type characteristics can be changed in the qualification of a digital asset.
Default thumbnail views
Various MIME types cannot be converted, for example, PDF files. For files like this, you can specify default thumbnails that are then displayed automatically. Of course, you can also specify thumbnails for graphics files, for example, if a graphic must not be converted
Note
You can upload default thumbnails centrally and then assign them to the respective MIME type.