Sentry attachments

Has anyone used attachment uploads from sentry?

Whenever the “extra” of “myAttachment” is found I try to upload it, but I never see it. In development I get a 201, but in prod I get “TypeError: Network request failed”.

  Sentry.Browser.addGlobalEventProcessor(event => {
    if (event?.extra?.myAttachment) {
      try {
        console.log('has myAttachment!');

        const myAttachment = event.extra.myAttachment;
        delete event.extra.myAttachment;

        const client = Sentry.Browser.getCurrentHub().getClient();
        if (!client) {
          console.error(
            new Error('No client available.'),
            'sentry.uploadMyAttachment'
          );
          return event;
        }

        const dsn = client.getDsn();
        if (!dsn) {
          console.error(
            new Error('No client DSN available.'),
            'sentry.uploadMyAttachment'
          );
          return event;
        }

        if (!event.event_id) {
          console.error(
            new Error('No event_id available.'),
            'sentry.uploadMyAttachment'
          );
          return event;
        }

        const endpoint = attachmentUrlFromDsn(dsn, event.event_id);

        const formData = new FormData();
        formData.append(
          'my-attachment',
          new Blob([JSON.stringify(myAttachment)], {
            type: 'application/json'
          }),
          'myAttachment.json'
        );

        console.log('has myAttachment endpoint!', endpoint);

        fetch(endpoint, { method: 'POST', body: formData })
          .then(async res => {
            const text = await res.text();
            console.log('has myAttachment response!', {
              status: res.status,
              text
            });
          })
          // we have to catch this otherwise it throws an infinite loop in Sentry
          .catch(error => {
            console.error(error, 'sentry.uploadMyAttachment.fetch');
          });
      } catch (error) {
        console.error(error, 'sentry.uploadMyAttachment');
      }
    }

    return event;
  });