In 5.9, a new Asset match configuration is introduced.

Basic configurations for Asset match

1. The simplest configuration is upload only with no metadata and Asset match strategy: No matches. In this case, the Match metafield is Relative path - Fullpath UNC (must be the same as what is in Stamp field).

   Open

   

    

   If you have an asset in MM with Fullpath UNC like this and it is unique

   Open

   

   if you import file with name File1.png it will have the same Fullpath UNC.
   So it will match and replace Asset in MM.

2. Upload with metadata from sheets and Asset match strategy: Metafield.
   a. Users usually Match metafield Fullpath UNC. MatchTokenColumn must in this case be the same as FileNameColumn:

   Matching will work like in case 1. You can use simple Excel sheet:

b. You can also match other metafield. When using another field than Fullpath UNC for match you must also use a different column for input and make sure the column has the proper values matching actual unique metadata values for the assets.
Here I configured Match field to be 'String' metafield:

Used this Excel sheet:

To match you need Assets with ‘String' metafieds values ‘file1’ and 'file2’:

As usual these values should be unique in the environment

3. Upload with metadata from sheets and Asset match strategy: AssetID.

Don’t forget to set MatchTokenColumn:

To match you just need to have assets with ID’s: 1492 and 1493:

And we know that ID’s are always unique