How to load PS Actions through UXP

UXP Developer Tool
2

If you want the UXP script, you cannot get the path automatically as you say. It will be roughly the same code on this page.

If it is a UXP plugin, you can specify the path as you like, so it can load an atn file in the same folder as the document you have open, for example.

const { localFileSystem } = require('uxp').storage ;
const { action, app, core } = require('photoshop') ;

const main = async () => {
  try {
    await core.executeAsModal(
      async (control) => {
        const doc = app.activeDocument ;
        if(doc == null) {
          app.showAlert(`Please execute with the document open.`) ;
          return ;
        }

        const docPath = doc.path ;
        if(docPath === '') {
          app.showAlert(`Please save the document and then execute it.`) ;
          return ;
        }

        // get atn file in same folder as active document
        const parentPath = path.dirname(docPath) ;
        const atnName = 'set1.atn' ;
        const atnPath = path.join(parentPath, atnName) ;
        const atnEntry = await localFileSystem.getEntryWithUrl(atnPath) ;

        // load an action set with the same name if it does not exist
        const actionSetName = path.basename(atnPath, '.atn') ;
        const whetherExistsActionSet = action.validateReference({_ref: 'actionSet', _name: actionSetName}) ;
        if(whetherExistsActionSet) {
          await app.showAlert(`No action set was loaded since it already exists.`) ;
          return ;
        } else {
          await app.open(atnEntry) ;
          await app.showAlert(`ActionSet '${actionSetName}' has been loaded.`) ;
        }
      }, 

      {'commandName': 'Load Action Set'}
    ) ;
  } catch(e) {
    await app.showAlert(e) ;
  }
} ;
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