Operating system
Android
Joplin version
3.3.10
Sync target
Dropbox
Editor
Markdown Editor
What issue do you have?
Images in some notes won't load.
This seems to happen randomly, AFAIK.
What exactly do the icons mean?
The download icons usually mean that the images are not yet downloaded from the sync target or that the images are in the process of being decrypted.
The "Attachment download behavior" setting in configuration > synchronization > advanced may be relevant here. It adjusts when/if images are downloaded. For example, if set to "Manual", Joplin waits until the "download" icons are clicked to download the associated resources.