Just to confirm, are you attempting this within the Shopify Shipping Manifests app? If so, we currently don't have any known issues or incidents in regards to this app.
Have you tried logging in to your Shopify admin, and accessing the app on an incognito mode or private browser window? If the issues still persist, you can also try to do so from another device altogether, just so that we can rule out any browser or caching issues.
If you're able to successfully load or print your shipping manifests using one of the methods above, chances are you'd need to clear your browser's cookies and cache on your usual device or browser.
If you're still running into issues however, you can reach out to our internal Support Team so that we can take a closer look at your account. While we're not able to provide any account-specific support via the Shopify Community at this time, we'd be happy to assist you further. Please visit our Help Centre here, and login to your account to create a support request.
This is happening within the Shopify IOS app, and I also tried on IOS chrome, IOS Safari, and MAC OS Safari.
I did finally get it to work in Mac OS Chrome but seems pretty ridiculous to not work within the native app on my phone so that I can just have the post office scan that.
I am also experiencing the same issue. The Shipping Manifests app will not load in my Chrome Windows browser nor on the IOS Shopify app.
I've since checked on my end, and it looks like there are now reports of others who are experiencing the same issue. Our internal team are aware of this and are looking into the matters further. If you're still experiencing the issues on your end, you can reach out to our Support Team by visiting our Help Centre here, and logging in to your account to create a support request. From there, our team can take a look into your account and if needed, escalate the matters to our internal Technical Team for further investigation.
Have you also tried to log in to your Shopify admin, and to access the app on an incognito mode or a private browser window? Is the issue intermittent, or happening all the time on your end?
If you're still having issues with accessing the Shopify Manifests app, please reach out to our Support Team by visiting our Help Centre here. While we're not able to provide account-specific support via the Shopify Community at this time, contacting us via the Help Centre will allow us to look into your account to further help.