Images in Messages not showing when I want to send one

Hi barjo,

welcome to this Apple (user-to-user( Community!

Re: "Images in Messages not showing when I want to send one"

Wondering in which of the ways available you were trying to show the images in order to choose one to send.

Eg: Are you selecting an image in the Photos app, and trying to share that via Messages ?

or

Are you trying to view images others have sent to you in messages app in order to send one of them ?

or

neither of the above ....

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Re: "What does this mean.“CFNetworkDownload_ThWZKo.tmp” couldn’t be moved to “Caches” because either the former doesn’t exist, or the folder containing the latter doesn’t exist. I get this error and a blank trying to load message images. "

Seems the error message may mean that you were trying to load an image that didn't exist.

Here's Apple Support's online article for MacOS 26

Keep track of shared content in Messages on Mac - Apple Support

Eg: says:

Content sent to you with Messages automatically appears in a Shared with You section in those apps when you turn on Shared with You. For example, when Shared with You is on for Photos, an image a friend sends you also appears in your photo library.

1. Go to the Messages app  on your Mac.
2. Choose Messages > Settings, then click Shared with You.
3. Click Turn On.

To stop getting the content you receive in Messages in the Shared with You section of other apps, click Turn Off, or unselect individual apps in the list."

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Re: "This has happened when I switched to Tahoe 26, I do not have this issue on my iphone 16pro or my iPad air."

The MacOS is a different operating system.

Sometimes, after a major upgrade, things may work differently than you were used to in earlier MacOS versions.

Send photos and videos in Messages on Mac - Apple Support

Eg: says:

1. Go to the Messages app  on your Mac.
2. Select a conversation.
3. Click  to the left of the message field (near the bottom), then click Photos.
4. Select a photo or video from your library or search for one you want to send.
5. You can also drag photos or videos to the message field, or copy and paste them.
6. To include a written message with the photo or video, type it in the field, then press Return."

View photos, videos, and audio in Messages on Mac - Apple Support

Eg: says:

1. "Go to the Messages app  on your Mac.
2. Select a conversation.
3. Do one of the following:

• • View photos or videos in the conversation: View the photo, play the video or double-click the file. The file appears in a Quick Look window.
• View photos or videos in the conversation details view:Click the contact or group icon at the top, click Photos, then double-click a file to open it.
  • Note: To view a video or play a Live Photo, open it in the conversation or Control-click it, then choose Add to Photos Library.
• View items in a photo stack: When you receive four or more photos, they appear as a photo stack. If you have a trackpad or Magic Mouse, swipe left or right with two fingers on the stack to see each photo without opening it. Control-click a photo in the stack to open it, reply to it, add a Tapback and more.
  • Tip: To see each individual photo in a grid, Control-click the stack, then choose Show Grid. Click  to return to the conversation."

Hope there's something useful to you here, to help solve the difficulty..

All the best :-)