I opened a pdf file with some `+` from the Files app in Firefox nightly and it works well. The first part of the URI is `org.mozilla.fenix.feature.downloads.fileprovider` so it looks like the content provider is something under our control. A quick look in searchfox gave me: https://searchfox.org/mozilla-central/source/mobile/android/android-components/components/support/ktx/src/main/java/mozilla/components/support/ktx/android/content/Context.kt#193-197 Maybe the file path can't contain any `+`.
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I opened a pdf file with some `+` from the Files app in Firefox nightly and it works well. The first part of the URI is `org.mozilla.fenix.feature.downloads.fileprovider` so it looks like the content provider is something under our control. A quick look in searchfox gave me: https://searchfox.org/mozilla-central/source/mobile/android/android-components/components/support/ktx/src/main/java/mozilla/components/support/ktx/android/content/Context.kt#193-197 Maybe the file path can't contain any `+` or cannot be too long.