Initially filed as bug report, see below. Needs more requirements (generic, not only S3).

Steps to reproduce:

• I try the DAM Connector Pack with Amazon S3 Assets.
• I want to get Image renditions from S3, but Text & External Image doesn´t get the rendition with S3 Assets.
• When I tried with an S3 Asset the method

  info.magnolia.dam.templating.functions.DamTemplatingFunctions#getRendition(info.magnolia.dam.api.Asset, [com.google.common.net|http://com.google.common.net/].MediaType, java.lang.String)
  

  the object returned is:

  info.magnolia.dam.core.NoOpAssetRenderer$NoOpAssetRendition
  

Expected results

• Get renditions as for a Magnolia Asset
• Trying the same template script, same theme, same site with a Magnolia Asset it returns:

  info.magnolia.dam.imaging.ImagingBasedAssetRenderer$ImagingBasedAssetRendition
  

Actual results

• Failing to get renditions, see above

Workaround

At this moment to get different image sizes in amazon S3  it´s necessary to upload it in different sizes instead of once and get the renditions.

Dev notes

• the fix is in the DAM, there is a check for JcrASsets only