Instagram does not allow you to directly upload stories from a PC through its website. However, there are some alternative solutions you could try:
1. **Use browser developer mode**: Some people have found ways to upload stories from a PC using the browser's developer mode. This method involves emulating a mobile version of Instagram in your web browser. However, keep in mind that this method can be complicated and may not always work correctly.
2. **Use third-party apps**: There are third-party apps available that allow you to upload stories to Instagram from a PC. However, it's important to be cautious when using these apps as they may not be secure or may violate Instagram's terms of service, potentially leading to the suspension of your account.
3. **Send the story via direct messages**: An alternative option is to send the photo or video you want to share as a story via direct messages to your Instagram account from your PC. Then, from the Instagram app on your mobile device, you can save the photo or video sent as a direct message and then publish it as a story.
4. **Use social media scheduling tools**: Some social media management tools offer the ability to schedule and publish stories on Instagram from a computer. However, many of these tools are paid and may be targeted towards businesses or influencers.
It's important to remember that Instagram is constantly evolving, and features and functionalities may change over time. I would recommend periodically checking if Instagram has introduced the ability to upload stories from a PC officially.