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Salesforce can't switch to lightning
Depending on your user profiles, you may get different permissions for Salesforce lightning. Here are a couple of things you could check if you can’t perform the trick:
Salesforce can't add chart to report
This is another common issue faced by sales managers / sales directors, who work a lot with reporting. If you can't add charts to your report, here's how to fix that in Salesforce.
Salesforce can't upload file
According to Salesforce, files are essentially structured as Content, which has no way to set the Content Version's universal value. So when you can't upload files to Salesforce, most likely it's because the universal field value is required. Here's how to quickly fix this in Salesforce and get your job done.