Filestack pick example

var client = filestack.init(window.FILESTACK_KEY);

      client.pick({
        accept: [
          // Image
          'image/*',
          '.psd',
          // Video
          'video/mp4',
          'video/quicktime',
          '.mov',
          // Audio
          'audio/mpeg',
          'audio/mp3',
          '.mp3',
          'audio/wav',
          'audio/x-wav',
          '.wav',
          // Document
          '.pdf',
          'application/pdf',
          '.doc',
          'application/msword',
          '.docx',
          'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
          '.odt',
          'application/vnd.oasis.opendocument.text',
          // Spreadsheet
          '.xls',
          'application/vnd.ms-excel',
          '.xlsx',
          'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
          '.ods',
          'application/vnd.oasis.opendocument.spreadsheet',
          // Presentation
          '.ppt',
          'application/vnd.ms-powerpoint',
          '.pptx',
          'application/vnd.openxmlformats-officedocument.presentationml.presentation',
          '.odp',
          'application/vnd.oasis.opendocument.presentation',
          // Other
          '.html',
          'text/html',
          '.txt',
          'text/plain',
          '.ai',
          'application/illustrator'
        ],
        fromSources: UPLOAD_SOURCES,
        storeTo: {
          location: 's3'
        },
        lang: 'en',
        maxFiles: 20
      }).then(function(result) {