As of March 2nd, 2020, the Instagram platform will be deprecating its API. This will directly affect the Instagram feed section in all WordPress & Shopify themes. Read more on how it affects your theme here: https://fuelthemes.net/important-notice-instagram-feed-removal/

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This is a common server/hosting issue. You need to ask your hosting to increase your PHP max_upload_size variable, preferably above 25mbs.

Here is a sample code you can pass onto your hosting:

upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 300