# Document Class + Preloading + Export on 1st Frame

**URL:** <https://forum.kirupa.com/t/document-class-preloading-export-on-1st-frame/282507>\
**Category:** flash\
**Created:** [February 23, 2009, 1:31am UTC](https://forum.kirupa.com/t/document-class-preloading-export-on-1st-frame/282507 "2009-02-23T01:31:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![matthewjumps](https://avatars.discourse-cdn.com/v4/letter/m/49beb7/32.png) [@matthewjumps](https://forum.kirupa.com/u/matthewjumps)\
**Post date:** [February 23, 2009, 1:31am UTC](https://forum.kirupa.com/t/document-class-preloading-export-on-1st-frame/282507/1 "2009-02-23T01:31:56Z")

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Hi everyone, long time no post 🙂

After recently (finally) migrating to AS3, I’ve been having a problem with preloading and document classes…Say I have a library full of sounds and movie clips that are set to export for AS, and I’m also using a document class. If I want to preload, obviously I need to change where my library assets export (eg, not the first frame).

How do I get this working properly? I tried unchecked “Export in 1st Frame”, then on frame 2 of the stage I put all my assets inside a movieclip…but in my document class when i try play sounds from the library it doesnt work?