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The servers are heavy with traffic
If Instagram’s servers are heavy with traffic because many people are using the app, stories might take a long to upload.
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The file is too big
If the picture or video you’re trying to upload to your stories is too big, it might take a long time to finish uploading.
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Slow internet connection
Using a slow internet connection can elongate the process of uploading a story on Instagram.
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Restricted network
Some networks restrict Instagram and other social media apps, which might cause some features not to work properly.
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Application is out of date
Your application may need to be updated to function properly.
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Due to using a shared internet connection
If you’re using a shared internet connection, there’s a great possibility that the story is taking a long to upload because many people are using the network. (See Why Instagram followers dropped suddenly?)
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Due to connectivity problems
If your internet connection keeps cutting off, it might elongate the process of uploading a story.
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Due to using 3G internet
Using the internet over a 3G network may slow down the uploading of a story.
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It’s a universal problem
There was a recent incident in May where Instagram’s stories feature wasn’t functioning properly. In this case, the problem was universal. (See Why Facebook is better than Instagram?)
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Video doesn’t meet Instagram’s specifications
If the video doesn’t meet Instagram’s specifications regarding size and format, it may not upload.
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The application was closed during the upload
Uploading a story might get interrupted and slowed down if the app was closed during it.